Initial idea.

src/en/space-station-14/departments/engineering/proposals/holodeck.md

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+# The Holodeck or the Holography Laboratory
+
+| Designers | Implemented | GitHub Links |
+|---|---|---|
+| CptJeanLuc | :x: No | TBD |
+
+## Overview
+
+Imagine a room on a station or shuttle which, upon interacting with a computer console you can have instantly remapped into one of many pre-programmed, or in-round assembled structures.
+
+## Background
+
+Currently we have various systems which generate dungeons, place entities into a paused map with the ability to return them, and replace station and planet tiles at whim.
+These are the core functionalities required for a holodeck.
+
+## Gafaw! but how!?
+
+The base principle, is that special holodeck walls and floor tiles can be placed and linked to from a holodeck computer console.
+The holodeck should be required to be enclosed by special walls, airlocks, and floor tiles. Should the enclosure break it should cease functioning.
+The computer console can select from a list of (a) premapped dungeon-like layouts, or (b) saved layouts that were constructed in round on the holodeck.
+When the console selects a premapped layout, it builds the holodeck room, walls, tiles, and entities within. It also marks all of these with a relevant HoloDeckWallComponent, HoloDeckFloorComponent, or HoloDeckEntityComponent.
+When the computer console is set to an empty state, the holodeck room should be returned to the state it was initially, comprised of the initial special walls and floors.
+When walls/tiles/entities are removed from the holodeck, they should be moved and placed on a paused map, or easier retrieval, and continuity.
+After the first time a premapped layout is selected, it should remain persistent via this method of moving the relevant entities to a paused map and back.
+If for any reason the holodeck is rendered non-functional, either by power loss, selecting an empty state on the console, or breaking the enclosure, the holodeck should return to the initial state.
+Entities with the HoloDeckEntityComponent should cease existing if they are removed from on top of a tile with an active HoloDeckFloorComponent. 
+
+The console should not function, thereby preventing remapping, while a player is on top of a tile with a HoloDeckFloorComponent, active or not.
+
+Preventing damage to players while on top of a tile with an active HoloDeckFloorComponent, unless the console is emagged, would be quite funny. Thats a stretch goal though.
+
+Somehow allowing players to ask for items in local chat and have them spawn in the holodeck, marked with the HoloDeckEntityComponent. This is a stretch goal.
+
+Either prevent construction within the holodeck, or make constructions made with any components having the HoloDeckEntityComponent also be marked with that component.
+
+How to make it non-euclidean is left as an exercise for the reader. (joke)
+
+## The rest?
+
+This is the beginning of the bike shedding.