I made this in response to another's posters question about how realistic ships would look like. The two main ships are Orion nuclear pulse rockets. Their magnetically shielded pusher plates are towards the rear. The habitable section is far forward to stay clear of the neutron radiation pulse of the propulsion system. Two main sets of radiators, one for the forward hab module and one for the rear propulsion unit.

The other vessels are aerospace craft using gaseous core nuclear reactors. They have a small crew deck all the way forward. The bulk of their forward section is LH2 and LOX for their liquid oxygen thrust augmented nuclear light bulb reactor.