are there going to be interactive IVAs? I really like raster prop monitor mod for KSP, which lets you play the whole game from 1st person (except building the rocket).
The plume exhausts on the sides seem a little too small, have you considered making a proper flame trench, or is it too complicated to do sub-terrain structures?
Have you considered Debian? it is veeeery stable, and has all the same things (in terms of packages, and package managers) you might expect from Ubuntu or Mint since they are built on Debian. I think that SteamOS might also be a cool idea if you have an all AMD system