I'm making my first ever building and would appreciate some advice with regards to window frames. I've made the walls from 2mm thick Benecreat Foam board, which has worked quite well, however, when I tried to cut out a window frame (of the standard white double glazing variety), I found the foam board flexed too much as I was cutting and I struggled to get straight edges. I'm wondering if 0.5mm ABS Styrene sheet would be more rigid, or would I be better using 1mm/2mm/3mm styrene strips and building the frames rather than cutting them out. I'm working in 1/50 scale and would be very grateful for any thoughts and/or other suggestions.

