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But printing the windows is cheating!
I like how you’ve got the main elements of the original sketch onto a smaller footprint without it looking cramped while retaining the overall vision. That can be difficult to achieve.
all looks very good except perhaps the support pillars inside the walls rather than outside but you probably have your reasons for that
Internal buttresses would make sense as counterforts to support against lateral force exerted from the outside of the wall.
Nice section of wall. Is the core resin or foam?