Liam, these are excellent models.
I like the solar explorers especially. I am working on similar stuff for a game idea.
Check out this site for some in depth technical info for developing realistic spaceships.
I think the maximum speed for generating 1G artifical gravity by centrifuge is 2 revolutions per minute (any faster and your crew would start puking due to awareness of spin: the coriolis effect). This rotation speed for 1G requires a minimum diameter of nearly 500 metres - half a klik! A slower spin would need a larger diameter to maintain 1G - if you see what I mean.
You could have spins at equivalent martian or lunar gravities though.
I'm a fan, keep it up.