Going through the scrap pile and I came across some cut offs from some new garage doors. Final measurement was 47 7/8”x21”x1 3/4” panels, surrounded by 2x4’s to be 3” bigger around the frame.
I have three panels for right now, put up two of them.
The best part of the day was teaching my son about the sliding compound miter saw, using the drill with small bits and not breaking them, learning how to read metric and standard on the tape measure (he preferred standard, lol), and a little bit about support and structure.