diff --git a/dkr/Dockerfile b/dkr/Dockerfile
index a4150f1..c871da3 100644
--- a/dkr/Dockerfile
+++ b/dkr/Dockerfile
@@ -24,6 +24,9 @@ RUN pip3 install jinja2
 ARG steemd_version=stable
 ENV steemd_version ${steemd_version}
 
+ARG STEEM_SOURCE="https://github.com/steemit/steem.git"
+ENV STEEM_SOURCE ${STEEM_SOURCE}
+
 ARG STEEM_STATIC_BUILD=ON
 ENV STEEM_STATIC_BUILD ${STEEM_STATIC_BUILD}
 
@@ -40,9 +43,9 @@ ARG SKIP_BY_TX_ID=ON
 ENV SKIP_BY_TX_ID ${SKIP_BY_TX_ID}
 
 RUN cd ~ && \
-	git clone https://github.com/steemit/steem.git && \
+    echo " >>> Cloning tag/branch ${steemd_version} from repo: ${STEEM_SOURCE}" && \
+	git clone ${STEEM_SOURCE} steem -b ${steemd_version} && \
 	cd steem && \
-	git checkout ${steemd_version} && \
 	git submodule update --init --recursive && \
         cd ~/steem && \
 	cmake -DCMAKE_BUILD_TYPE=Release . \
@@ -66,8 +69,11 @@ ARG STEEMD_BIN="/usr/local/bin/steemd"
 ENV STEEMD_BIN ${STEEMD_BIN}
 
 RUN echo "This container has been built with the following options:" >> /steem_build.txt && \
-    echo "----\nsteemit/steem version/commit: ${steemd_version}\n----" >> /steem_build.txt && \
-    echo "Default steemd executable: ${STEEMD_BIN}\n----" >> /steem_build.txt && \
+    echo "----" >> /steem_build.txt && \
+    echo "Git Repository:              ${STEEM_SOURCE}" >> /steem_build.txt && \
+    echo "Git version/commit:          ${steemd_version}\n----" >> /steem_build.txt && \
+    echo "Default steemd executable:   ${STEEMD_BIN}\n---" >> /steem_build.txt && \
+    echo "--- CMake Config Options ---" >> /steem_build.txt && \
     echo "LOW_MEMORY_MODE=${LOW_MEMORY_MODE}\nSTEEM_STATIC_BUILD=${STEEM_STATIC_BUILD}" >> /steem_build.txt && \
     echo "SKIP_BY_TX_ID=${SKIP_BY_TX_ID}\nENABLE_MIRA=${ENABLE_MIRA}\nCLEAR_VOTES=${CLEAR_VOTES}" >> /steem_build.txt && \
     echo "----\nBuilt at: $(date)\n----" >> /steem_build.txt
diff --git a/dkr_fullnode/Dockerfile b/dkr_fullnode/Dockerfile
index 15599f3..9dc2295 100644
--- a/dkr_fullnode/Dockerfile
+++ b/dkr_fullnode/Dockerfile
@@ -13,6 +13,9 @@ RUN apt-get update && \
 
 ARG steemd_version=stable
 
+ARG STEEM_SOURCE="https://github.com/steemit/steem.git"
+ENV STEEM_SOURCE ${STEEM_SOURCE}
+
 ARG STEEM_STATIC_BUILD=ON
 ENV STEEM_STATIC_BUILD ${STEEM_STATIC_BUILD}
 
@@ -20,7 +23,7 @@ ARG ENABLE_MIRA=ON
 ENV ENABLE_MIRA ${ENABLE_MIRA}
 
 RUN cd ~ && \
-	git clone https://github.com/steemit/steem.git && \
+	git clone ${STEEM_SOURCE} steem && \
 	cd steem && \
 	git checkout ${steemd_version} && \
 	git submodule update --init --recursive && \
diff --git a/example.env b/example.env
new file mode 100644
index 0000000..e422ecc
--- /dev/null
+++ b/example.env
@@ -0,0 +1,71 @@
+# This is an example .env file containing common environment variables that can be customised
+# by the user, to allow steem-docker to be adjusted to the user's specific needs,
+# as well as to aid with running multiple instances of steem-docker.
+#
+# Note: The .env file is loaded by run.sh after several variables are already set.
+#       This means that you can reference variables such as $DIR (detected folder of run.sh),
+#       $DATADIR (absolute path to steem-docker/data) etc.
+#
+#
+
+# Unique name to label the container created by this steem-docker installation
+DOCKER_NAME="seed"
+
+# Default docker image to run using ./run.sh start / restart / replay
+# Also used when tagging remote image downloaded from ./run.sh install
+DOCKER_IMAGE="steem"
+
+# Comma separated port numbers to expose to the internet (binds to 0.0.0.0)
+PORTS=2001
+# Advanced Usage Example: 
+#
+#   Expose 2001 to the internet, but only expose RPC ports 8090 and 8091 onto 127.0.0.1 (localhost)
+#   allowing the host machine access to the container's RPC ports via 127.0.0.1:8090 and 127.0.0.1:8091
+#
+# PORTS=2001,127.0.0.1:8090:8090,127.0.0.1:8091:8091
+
+# Amount of time in seconds to allow the docker container to stop before killing it.
+# Default: 600 seconds (10 minutes)
+STOP_TIME=600
+
+# Websocket RPC node to use by default for ./run.sh remote_wallet
+REMOTE_WS="wss://steemd.privex.io"
+
+# Remote docker tags to pull when running ./run.sh install OR ./run.sh install_full with no arguments, respectively
+DK_TAG="someguy123/steem:latest"
+DK_TAG_FULL="someguy123/steem:latest-full"
+
+# Git repository to use when building Steem - containing steemd code
+STEEM_SOURCE="https://github.com/steemit/steem.git"
+
+# LOCAL folder containing Dockerfile for ./run.sh build
+DOCKER_DIR="$DIR/dkr"
+# LOCAL folder to hold witness_node_data_dir
+DATADIR="$DIR/data"
+# LOCAL folder to store shared_memory.bin (or rocksdb files for MIRA)
+SHM_DIR="/dev/shm"
+
+# blockchain folder, used by dlblocks
+BC_FOLDER="$DATADIR/witness_node_data_dir/blockchain"
+
+# Example RocksDB configuration file, will automatically be copied to MIRA_FILE on first run.sh execution
+# if MIRA_FILE doesn't exist
+EXAMPLE_MIRA="$DATADIR/witness_node_data_dir/database.cfg.example"
+MIRA_FILE="$DATADIR/witness_node_data_dir/database.cfg"
+
+# Example Steem node configuration file, will automatically be copied to CONF_FILE on first run.sh execution
+# if CONF_FILE doesn't exist
+EXAMPLE_CONF="$DATADIR/witness_node_data_dir/config.ini.example"
+CONF_FILE="$DATADIR/witness_node_data_dir/config.ini"
+
+# Array of additional arguments to be passed to Docker during builds
+# Generally populated using arguments passed to build/build_full
+# But you can specify custom additional build parameters by setting BUILD_ARGS
+# as an array in .env
+# e.g.
+#
+#    BUILD_ARGS=('--rm' '-q' '--compress')
+#
+BUILD_ARGS=()
+
+
diff --git a/run.sh b/run.sh
index 872cf0c..8e6a5aa 100755
--- a/run.sh
+++ b/run.sh
@@ -4,6 +4,19 @@
 # Released under GNU AGPL by Someguy123
 #
 
+
+# Error handling function for ShellCore
+_sc_fail() { >&2 echo "Failed to load or install Privex ShellCore..." && exit 1; }
+# If `load.sh` isn't found in the user install / global install, then download and run the auto-installer
+# from Privex's CDN.
+[[ -f "${HOME}/.pv-shcore/load.sh" ]] || [[ -f "/usr/local/share/pv-shcore/load.sh" ]] || \
+    { curl -fsS https://cdn.privex.io/github/shell-core/install.sh | bash >/dev/null; } || _sc_fail
+
+# Attempt to load the local install of ShellCore first, then fallback to global install if it's not found.
+[[ -d "${HOME}/.pv-shcore" ]] && source "${HOME}/.pv-shcore/load.sh" || \
+    source "/usr/local/share/pv-shcore/load.sh" || _sc_fail
+
+
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 : ${DOCKER_DIR="$DIR/dkr"}
 : ${FULL_DOCKER_DIR="$DIR/dkr_fullnode"}
@@ -43,7 +56,11 @@ RESET="$(tput sgr0)"
 # Default: 600 seconds (10 minutes)
 : ${STOP_TIME=600}
 
-# default. override in .env
+# Git repository to use when building Steem - containing steemd code
+: ${STEEM_SOURCE="https://github.com/steemit/steem.git"}
+
+# Comma separated list of ports to expose to the internet.
+# By default, only port 2001 will be exposed (the P2P seed port)
 : ${PORTS="2001"}
 
 # Internal variable. Set to 1 by build_full to inform child functions
@@ -53,6 +70,7 @@ CUST_TAG="steem"
 # Placeholder for BUILD_VER shared between functions
 BUILD_VER=""
 
+
 # Array of additional arguments to be passed to Docker during builds
 # Generally populated using arguments passed to build/build_full
 # But you can specify custom additional build parameters by setting BUILD_ARGS
@@ -138,7 +156,11 @@ IFS=","
 DPORTS=()
 for i in $PORTS; do
     if [[ $i != "" ]]; then
-	    DPORTS+=("-p0.0.0.0:$i:$i")
+        if grep -q ":" <<< "$i"; then
+            DPORTS+=("-p$i")
+        else
+            DPORTS+=("-p0.0.0.0:$i:$i")
+        fi
     fi
 done
 
@@ -217,13 +239,26 @@ parse_build_args() {
             shift; shift;    # Get rid of the two tag arguments. Everything after is now build args
         fi
     fi
+    local has_steem_src='n'
     if (( $# >= 1 )); then
         msg yellow " >> Additional build arguments specified."
         for a in "$@"; do
             msg yellow " ++ Build argument: ${BOLD}${a}"
             BUILD_ARGS+=('--build-arg' "$a")
+            if grep -q 'STEEM_SOURCE' <<< "$a"; then
+                has_steem_src='y'
+            fi
         done
     fi
+
+    if [[ "$has_steem_src" == "y" ]]; then
+        msg bold yellow " [!!] STEEM_SOURCE has been specified in the build arguments. Using source from build args instead of global"
+    else
+        msg bold yellow " [!!] Did not find STEEM_SOURCE in build args. Using STEEM_SOURCE from environment:"
+        msg bold yellow " [!!] STEEM_SOURCE = ${STEEM_SOURCE}"
+        BUILD_ARGS+=('--build-arg' "STEEM_SOURCE=${STEEM_SOURCE}")
+    fi
+    
     msg blue " ++ CUSTOM BUILD SPECIFIED. Building from branch/tag ${BOLD}${BUILD_VER}"
     msg blue " ++ Tagging final image as: ${BOLD}${CUST_TAG}"
     msg yellow " -> Docker build arguments: ${BOLD}${BUILD_ARGS[@]}"