Personally I’m into arrow shaped space ships, so I’m going to be aiming for something along those lines on my first playthrough. Think of an Anaconda from Elite Dangerous, or a RSI Galaxy from Star Citizen, how big it is depends on how the systems and ship building work.
I definitely want something as sleek and “fast” looking as I can make it - I always liked the really long nose fighters in No Man’s Sky, so something similar maybe. Cargo ships will be an opportunity to explore the other side too, with less clean lines and more of a “junky hauler” feel.