So since you have those ships already modeled and rendered, what else needs to be done with those exact ships your posted (trith ships) ?
Only those crossed out have been built. What makes you think all of them are finished?
what kind of results are you looking for? what kind of save file for the 3d object? what size texture maps and how many? how many polys? etc...
It doesn't really matter what software you are using. Most packages support exporting .obj or .fbx or something else I can export in max. Textures: normal, diffuse, spec, glow. Polycount: keep it reasonable, this is lowpoly, but it's also not 5 years ago. The bigger ship in this image
(which is a small hull) is at 1600tris, the fighters are at about 350 I think. A huge hull like in the concept can probably be around 3k or 4k. It's a bit hard to estimate theses things at the moment, so just keep is reasonable for now.