These scripts are semi-automated and designed to create and modify custom Gentoo-based LiveSystem (from stage3) that can be burned to DVD or recorded to Flash Drive
Don't hesitate to adjust them for youself
Running buildsysio.sh without any argument shows list of exist arguments, here they are:
start: chrooting into exist system to made changes
stop: umounts exist chroot session
iso: packing live system into squashfs image and then create iso image
buildroot: create live system from scratch (from stage3)