Nice ship! I particularly like the turret mount Oh no, it's the operator cockpit The cargo docking bay might be too small for a container And some greebling would better convey the sense of scale
BTW, this is exactly 100 m long (in fact, the 100 m mark is not printed, otherwise I would have had to make it 100.5 m long), but by the same token they are "stackable"; --you could create a km long variant by attaching 9 extra copies of itself as sub-units.
You're right. I think I can just shift the texture. It's 4 texels per millimeter, so I could shift the texture 1 texel and that would put half a mark at each end; I think this would be the most intuitive.