Is there a SNES Repro Cart guide?

[Blasingame]

Hello,

I am looking for a guide on building SNES repro carts. I checked all over zig's repro topic, but I was unable to locate a guide for this. I think the idea of building next to official carts of games that look genuine excites me.

Basically I am in the curiosity/research stage, just to find out how much of my time and money could go into making a SNES repro cart.

Also is there a listing online somewhere that lists compatible donor carts for games?