I ended up focusing on Sock's unreleased/non-playable demo map (with the gargoyles and flesh), as I couldn't think of anything more gothic that has ever been made in Quake than that. I also showed the following video which shows some tapestries based on Tolkien's drawings being displayed in a cathedral in France:
So it ended up being more about how radically distorted versions of the middle ages, especially gothic architecture, end up preserving some medieval aesthetics in weird ways.
As for Keep... I am very much looking forward to delving into it. I'm aiming to use it for future maps. For the past couple years I've been swamped IRL but this summer I will finally have some time. Maybe eventually I'll write up an article on design trends in modern Q1SP, lots of amazing stuff has come out that I haven't even played yet and it's as interesting as ever to see architectural features evolve and influence one another.
Looks great Madfox, I like that you are using an actual model of the architecture. I have tried making a cathedral in Quake too but I just winged it so the scale is hard to get right.