/sci/ - Science & Math

Well first you have to decide on a plausible Isp, thrust, thrust to weight, and size of your fictional fusion engine.

I think you'd be looking at a cylindrical ship, because wasted mass will never be a thing.
Engines mounted on the side, able to gymbal around for control.
With a good amount of radiators around your large fusion engines.

Do large cruise ships have small boats to carry crew? No that sucks and is wasteful. Instead they just dock where they are able.
So these fancy ships would only land on low grav worlds, such as the large moons, Mercury, Ceres, Pluto, etc

Perfectly aerodynamic will not be necessary, however you still will build ships that maximize internal size for materials used.