Sci-Fi vs. Fantasy | Update 1

Here's the first update for our game (still no title, working title is "SciFi vs Fantasy")
I do the level design and building creation. I also put the world aspects together in the engine. Here's the progress we have so far.

Admittedly, I'm a bit worried that we went too ambitious with this. I'm putting in a lot of work but the level is coming slower than I'd like. Our pipeline works well - I do the buildings, give them to Dustin to UV and he gives them to Gabby to texture or paint, then they come back to me to go in the engine - but it isn't as quick as I'd like and it has me worried about the final of the castle.
Here ALL of the Concept pictures I have so far:

OUTSIDE PICTURES
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INSIDE PICTURES
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Here's the final reference I went with for the exterior design. It was pretty much exactly what I'd pictured in my mind, utilized gothic architecture (which I love) and wasn't too too complicated.
I believe this is where I originally found it from a google image search though I can't speak to if this is the true original creator of the image.



Here's also two images of buttress designs I used to make my buttresses (shown later)




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following are pictures from in-engine
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This is from inside the walls I've made. The plan is to have hanging braziers with fire to light the insides, where each light is.


This is with one of the interior rooms removed, but showing where the doors are.