I Googled this and used the forum search function here and havent found anything to suggest that someone has drawn up or found schematics for ANY game cartridges, just consoles. I was thinking about doing this myself but I will preface this by saying I once had the idea of mapping out 2D games using either the Retron 5 or an emulator and assembling screenshots to put together full maps of games but theres a website that already did this.

I would be really discouraged to start doing this only to find out later on there is a already a trove of hundreds of pictures of schematics for carts done professionally and I learned that I wasted my time.