FLOOR and BACKGROUND 
Background is ready for device, floor only for simulator or raspberry pi, great for making racing games.
I have lots of crazy ideas where this can go, I think that simple Minecraft style is possible to achieve
I only dont know how to combine your work with mine, I tried to make extension, that would use your extension (using “extend”), but you have to many private variables
HOW TO USE - right now open this project and start from scratch, make sure to set walls as “walls”