Either a physical board is good. Or some gerbers outa Eagle or Altium or Orcad or whatever it is you are using is good too. It's best to design to the measurements, but then of course always to double/triple/quadruple check everything as you go.
I joined the monero slack, I don't know if you are there to chat or anything. I can also drop by IRC to discuss this as well. Cheers!
Edit: I have the exact measurements ala breaking bitcoin repo, ty.