I started modelimg a simple submarine in Wings 3D. I've always found fascinating the old german WW2 U-Boots. There is a charme in such weapons, even if they bring destruction :(

I find that a submarine is the thing closest to a starship. There are many concepts: for somebody a starship is an anabolized plane, for some other is an assembled thing (like Alien's Nostromo), but when I think to a starship I remember Starblazers of Leiji Matsumoto or the opening scenes of Luc Besson's Fifth Element.