Source: https://www.youtube.com/watch?v=c5pzjAUv19Y
I started watching these vids just a few days ago, and although I wasn't too surprised by all the graphical shortcuts and low resolution textures hidden in spots you couldn't really see in game, it quickly occurred to me that if we do indeed get space legs, we may not be walking around admiring the interiors of our ships. Instead, Legs will probably implemented in new station interiors or on planetary surfaces. Yes, FDev could do a massive re-haul on the way the ships are built inside the cockpits/interiors, but.... seems like it would be a lot of work to me, and the kind of changes that come with bug infestations and more instance lag (due to more things being loaded in inside ship interiors) .
Would Space Legs still be cool without the ability to walk around inside our ship? Probably... if we get some content to do with out legs along with the ability to use them. But I have a feeling that we won't get the ability to walk around in our ships after watching those videos.
I'll say here what I said in another thread positing a similar question. Frontier have a precedent of putting the work in to bring geometry and textures up to scratch to go along with the additional gameplay. Multicrew had cockpit geometry and textures updated; planets first had their non-landable placeholder textures replaced to allow for planetary landings, and then more recently had their surfaces updated to make them look better.
No reason to believe that Frontier would balk at the work of updating interiors further to accommodate walking around.
Let's think about what we've got to work with:
3 starport variants - most of which internally could be very similar and re-use assets reasonably
Many variants of outposts, both planetary and space-based (including installations) - but again, re-use of internal assets would be reasonable. Once you've designed a couple of corridors and a few shop-fronts, you've designed them all.
Ship interiors - There will inevitably be changes to layout and some different things in the ships themselves, but our ships are modular... so you only really need to design for the outfitting options and put them together in the ships. Corridors can possibly be the same as for starports.
That would be a lot of work, for sure, but not unreasonable to expect, and I strongly suspect this would be the lowest common denominator for the work, and given the timeframe, there's no reason to believe Frontier won't also create some individualised pieces for interiors.
But I'm not a game developer by any stretch of the imagination; but I keep coming back to the idea that this expansion has had long enough to bake that a whole new game could have been developed in the time. In that sense, I don't see why there wouldn't be time to do it all.