As an update to this more pics can be found here:
https://shodan.fandom.com/wiki/The_Art_of_System_Shock

I would love to play the scrapped version they did before changing the plans. Re-imagined Citadel and the game itself — everytime I watch the videos they give me shivers!

About the low-res textures — I swear I saw that part in one of the developers diary videos, where a modeler was doing a hatch or something, and he did a very polished and nice looking model, and then: "now we resize the textures to 512x512, because of the artistic style" — and suddenly it looks like crap!  It took me pretty much time to get used to this... style.

low quality textures and using limitations artistically are something that games in general have been doing for years. System Shock Remake was made to be accessible to a wider group of people, accessibility includes people with craptops that can only play games that require little effort for low end hardware to run. This is extremely refreshing in the current gaming sphere with most titles tanking hardware with file sizes. And like I was saying, those chunky imperfect pixels and shapes help create a more dirtier and crunchy look which is supposed to pay homage to the original and it's artsyle. Also nightdive is still an indie studio y'all had, and honestly still have AAA expectations for what they can do.

Imma be real I prefer the way the final product looks honestly, it still has that industrial look and that's what made the original stand out. Sometimes straying toooo far beyond the game's original vision isn't a good idea and I think that's why nds scrapped these concepts especially the environmental ones. The environment and level concepts specifically look too sleek for system shock 1 and citadel station in general, assuming they're for medical judging by the colour palettes used. Speaking of, what makes medical in my opinion a memorable level is that it juxtaposes the purpose of the area with a brutal industrial feel, especially the pipe area that also creates an interesting conflict. It also helps characterize trioptimum more and tells us and the hacker that this huge corpo could give a shit less if their infirmary was sterile and easily accessible (which is why we see ramps near surgery beds comatose patients would sleep in and force bridges over huge drops.) That's why I think going for a sleeker look for citadel would actively harm the vision and storytelling of system shock 1, which is exactly what a remake shouldn't do.

The remake DID originally look like those concepts. That was the original "reimagined" remake, that they had to drop when they ran out of money.

I loveee these serv bot concepts! They really have this cool retro futuristic vibe to them that would mesh really well with the exec bots and by extent the executive deck!! Honestly wish we got more art deco and retro futurism in the remake than what we already have

For the sake of the wiki and my own curiosity I got the art book (digital version) and am currently working on saving a full copy, but in the meantime I found some neat stuff to share.