How would I be able to make a planet that resembles Melancholia?
As is always the case, I did not see that on the list. Oops .Of course it is in the Todo list:
> Internal structure of ships and buildings (indoor-engine)
The last part seems to imply the development of a specific engine module.
There are in fact some commands in the manual explicitly referring to internal maps.
Like you said, with the tools that SE gives us at the moment, seems to me a lot of work, that's probably the reason that nobody did that. I did some tests on a shuttle, not satisfactory enough. I didn't try yet what Mr.Abner said, will surely do.