unfortuanately, i cant think of any "plug-in" that would do what you want for free.
the only solution i can think of for your problem is a 3d program like 3DS, MAX 3, or maybe Maya or Lightwave. There are files on Scifi 3D that are complete environments compatible with these programs.
Other than that, i would suggest going on eBay and looking for these programs. Usually you can find cheap prices there. Or, go to a 3D program’s website and work w/ a trial run. Or, you could post around here and see if you can work with someone who has the program, and would be willing to help you for free.
