Honestly, for the price and headache of it all, you're better off purchasing precut pieces on eBay and assembling it yourself. They're around $100-200 these days. I ordered one years ago, I highly recommend going that route.
Raspberry Pi 4
For information, Recalbox IS NOT compatible with Raspberry Pi 4 yet.
Pour information, Recalbox N'EST PAS encore compatible avec le Raspberry Pi 4.
The Recalbox Team.