You have a print of how it comes out and you know how big you want it to be? Everything else does not matter it is just arithmetic. See my similar problem here.
I found some nice oak plywood at Lowe’s and as one sheet made 20 sheets I had a lot of sheets and was anxious to try it out. So I made that little snap together box and discovered that the box was designed for thinner stuff
Well even after cobbling the thing together it was like a kid who had outgrown their clothes, and not only that but I thought it small anyway… I could not bring it into inkscape but a bit of measuring the thickness intended and the oak plywood I discovered that the oak was …