This is amazing! I'm in awe with the surrounded themeing and the roof details. I'm actually working on something similair and there is a small chance you may have seen it on the workshop or reddit where i've posted it a week ago. I'm kinda jealous in a good way at how beautiful your is! It is nice to see how you have tackled some aspects of the build and see you've done a stellar job at it! On my build i've been trying to limit myself to the maximum piece count of 4000 to keep it available on the workshop and had to cut some corners on the detail and accuracy. I'll post some pictures as i'm sure you would be interested to see this. I don't have an rtx card like you so the global illumination is horrible but you'll get the idea.
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Started with a two part facade that has a low amount of pieces for the workshop
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Just last weekend i've finished my iteration of columbiad.(not as good as yours

)
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I've used the premium rides lsm as it had similair launch options. i did try and make it with the vector looping and played with brakes and a fast and a slow lift hill but its just not the same. i've recreated the layout from some schematics i've found so i think its pretty spot on in that aspect.
Workshop code for the lsm: 97TQFYZS6
Workshop code for the vector looping: 5CKBYJ0RM
Top down schematics are found on this page:
https://www.flickr.com/photos/63631877@N00/ i believe it was on page 7 the scale on them are 1:3 in feet.
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also tried to recreate the trains.
Workshop code for the full build: 25W55TD2F.
Anyways it will be nice to see your progress. Keep going as its absolutly amazing looking!