The file only concerns the 2 milled sides, other parts according to your own design. I myself have set the scaling to 350 mm high.
the bottom at 260 x 260mm and the roof parts 320 x 255mm. the raised edges 240 x 35 mm so that they do not adhere to the milled sides. this to drain any rainwater at the 4 corners
have fun duplicating.
Greetings from Holland