The photo match tool is a handy tool but man I really like using Onshape to draw. So much easier!
Many many years ago when I was working on my feed mill I discovered this method. I remember reading an article in Model Railroader as a kid on using a photo and drawing disappearing lines to measure a model. Same method here but just with digital lines. It’s not perfect but it sure helps.
Funny how I guessed the size of certain parts and low and behold I was pretty close in my guess. I’d assume that a builder would cut a hole at say 12’ vs 11’ 10 3/4". Lol