u/Relative-Actuary-271

Hi everyone,

I want to swap the stock P90 Dogears on my Epiphone Riviera P93 for Mini ProBuckers to get that traditional 3-pickup Riviera look/tone. I will have a professional luthier do the install, but I need to 3D print the conversion adapters myself first.

I’m looking for tips from anyone who has done a similar P90-to-Mini-Humbucker mod on an archtop:

1. Adapter & Archtop Fit: The stock P90s sit flat on top of the guitar's curved body. Do I need to remove the whole structure below them, or just replace the outer cover with my adapter? Any tips for CAD software, material (PETG/ABS?), or matching the body's curvature without drilling new holes?
2. Middle Pickup & Polarity: Does Epiphone sell an RWRP (reverse polarity) version of the Mini ProBucker for the middle position, or will my luthier need to flip the magnet/wires manually?
3. Pots & Push-Pull Mod: Should I upgrade the stock pots to 500k? Also, I want to add push-pull or push-push pots for coil-splitting. Do aftermarket Epiphone Mini ProBuckers even come with 4-conductor wiring to allow this, or are they strictly 2-conductor vintage spec?

Any millimeter measurements, past experiences, or advice on this messy project would be a lifesaver. Thanks!