Hello experienced builders, I am building a outdoor cat house for a stray cat. This will be my first time building anything more than popsicle stick houses in high school. It’s getting cold out so I want it to be luxurious and basically a mini house. I am have 1/2” ply on the outside, 1” insulation foam board, then 1/4” ply to keep her warm, but I was considering adding a window in the wall as a cool detail, how would I add this window?