Can you not use the 'Curtain Wall Curved' object under 08 Doors-Windows? Might need two with different radii to get the shape...in conjunction with a straight section perhaps? To do the top trimming, you'll have to use a roof or a subtraction via SEOps.
Just a thought...
Karl
AC 28 USA and earlier • macOS Sequoia 15.4, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB