So, you may have said this week, but Mach, I don't want a white background, I want a black one! Don't worry, I got you covered. A big thanks to ChaosZake for telling me how to do it.
First thing we need to do is create a land race, preferably on a flat area of land.
We will be using this prop, The Floating Platform.
What you need to do, is flip it over, we are going to be building using the backside of the platform.
And now, you just need to build a room out of this prop.