Thanks Michael and Peer,

I wasn't aware of the subset capability in booleans, that does simplify the job indeed. Simply selecting the two surfaces (in the first example case), or the layers of the walls (case 2 & 3), then doing boolean difference with only the curve as the cutting object does produce the cutouts nicely. I was hoping to also get the rudimentary frame (simple surfaces) but maybe I don't really need that.

I am going to continue pondering this script idea though and appreciate Peer’s ideas and pointers…will need some time to digest and experiment though!! The subset boolean has met the initial need on the model I’m currently working on.

—Larry