I've recently actually bought stuff from both glitchd and pocketadventures, so I'm comfortable recommending both of those vendors.

Somewhere outside of California where I could keep my years of service with my company (17) and get paid the same.

Pigrrl is a whole different unit from what I know, gameboy zero uses the gameboy shell.
Pi3 is good for some of the more involved games, but everything I've tried in the systems you mentioned, the zero is fine.

If I were you I'd dispute it with my credit card company/Paypal.
Unfortunately the only thing I see for the domain owner is Iniquity Games. Can't find anything beyond that.

Drill guides are here for the front buttons
https://github.com/kiteretro/Circuit-Sh ... Shield-FAQ

Shoulder buttons are only available if you are a patreon supporter for wermy I believe.

https://github.com/kiteretro/Circuit-Sh ... Shield-FAQ

Almost always at the bottom there is button templates

Could be worse. I was a super mod on a Nissan 300ZX forum in the mid-late 2000s and they would get hit with raunchy things like goatse etc.

I think that screen might be to big.
Honestly if I were you, I'd spend a few hours on youtube, there is a bunch of vids including a bunch from our fearless leader Wermy.

V3 screens are NLA. You might be able to find a single on AliExpress, but its not likely. Look for 2.6 inch TFT liquid horizontal screen ILI9342 51pin
Ribbon cable, get ahold of Helder and I think he can assist.