I think space legs should be left to other games.
Walking around most of the ships, especially the large ones would be tedious. Take a long look at some of the In-Scale pictures, specifically the one showing the ships parked above a football field, with a python over it, almost longer and wider than the field. You really want to have to navigate, on foot, ships that large?
Then there is having to add in things to interact with.
Then you have the performance penalty that comes with having ships that actually have internal areas. This means a lot more detail, a lot more to load, a lot more to render. Etc etc etc.
Let's focus on Quality of Life, and general universe improvements over adding half-baked "features". More Poi's, intelligent AI (Because my 1t of cargo, valued at 1,000cr is NOT valuable enough for every single pirate in the universe to be gunning for me.) more realism to the BGS (There is still an outpost that's been starving for years, still in famine. Why aren't they all dead?) QoL improvements to SRV's, more variety and style to them. New UI's, based on ship manufacturer, and modular, to allow for customization (and monetization, by seilling UI skins). Skins and decals as rewards for ranking up with at least super-powers (Some ranks unlock ships. Ranks between ship unlocks, could have decals and a skin for said ship.) We /JUST/ got a tripple Elite Decal, and they FINALLY started doing the occasional CG with a decal reward. I could go on, but I think I made the point I was going for. Sorry for the wall of text.