The game assets are there for reference, and if need be, to unfold if you are unhappy with the current files available.
Unfortunately the scaling will have to be done yourself. Gather all the reference images you can find, that way you can determine where a piece starts and ends, then measure it. I would suggest attempting to build the piece out of cardstock first, so as to ensure you're not wasting any foam if you put the whole thing together and it doesn't fit. Otherwise, there are plenty of tutorials on here which will enable you to find scaling techniques that better suit your style!