Hope you dont mind, but I used your curves to build the model (as shown in your first pic). I just wanted to see if MOI could build it as a solid. It came out OK. (I will not keep the model, I only built it to check out MOI V2)
Hehe thats ok, I found a photo on the web with this window and rebuilt it. My final render looks like this btw. I hope I don't go to copyright hell now ... sooner or later I'll build an entire cathedral