Tutorial for molding available
https://zortrax.com/3d-printing/efficient-industrial-molding-with-3d-printing-how-to-cut-costs-time-tutorial/
Michal Zalewski wrote a great guide on beta resin casting.
… he’s more of a CNC guy than reprap (he seems to disdain it) but it’s impressive. Your guide would be a great sister article since it shows how to accomplish mold casting using a FFF model source.