Daz has the F.V.C.S which can be configured into many different space crafts and there is Megallen and the shuttles at IW43D.com and there are also meshes at planit3d.com Antares in free stuff as well as AFA starship and props which could be used for a ship interior but building a spaceship from scratch is probably something most modellers won't do for free

You might as well PAY attention, because you can't afford FREE speech