This is every lego collector’s nightmare, how will it fit in the collection? Lol but for real though. I tried to put it in a bookshelf similar to how you have it but just didn’t work for me. I told you before but gonna put it on a wall shelf with another big UCS type set. I also wanna say, now that you brought up that hoth at st i believe that was? I was actually thinking about getting it but didn’t know if the scale was appropriate with the UCS AT AT. I remember in the movie it was small but idk if it was that small.
Literally haha. I was a bit nervous about fitting it in the collection after seeing the finished product. I think putting it on a wall shelf with another UCS set would make for a good display so I hope it turns out how you want it to! Regarding the AT-ST I think I heard somebody say they were the same scale but it probably isn't exact. Regardless though I do think they look really cool next to each other so I'd definitely recommend getting the AT-ST if you can find a good deal on it :)
That's a tough question lol. Off the top of my head it goes falcon, at-at, venator, razor crest, gunship. I feel like if I sat down and really thought about it though the list might be different haha. All of them are such good sets and so hard to compare to one another.