Very nice

. A couple of coments.
Thank you.

Core ability is vastly overpowered when used to pay rep for magic items. I would remove Legend from the equation, as legend is already giving you Rep each adventure. Even then it makes me cringe. Making each point of rep cost 25 silver might also help.
1 Rep = 25s seems good to me. One of my big questions was actually concerning this equation.
Because Genius Tinker is greatly inferior to a "flawless" ability (single skill, takes time, limited uses), with one decent upside (can be used on an error) I'd probably remove the restriction on number of uses.
I don't know. I actually based its mechanics on the Wheelman's ability. It might seem weaker than "flawless" abilities at first, but the number of skills concerned increases at levels 11 and 19.
Arcane Library relies on having feats which you might not have.
That's precisely why it's a "choice" ability. If you don't have the feats, you don't take it.
Arcane Experiement should probably give you a number of choices you can scribe, rather than unlimited choices. Infinite = busted.
Definitely.
Museum of the strange should probably mirror the Courtier ability as others have described.
Indeed, I completely missed Hoard.
Be aware that Attune magic Item can be hideously abused by creating magic items, and then giving them away for rep you can use for anything.
Yop, I didn't even consider that characters could
earn Reputation by selling items. Would it be unfair to forbid such an attempt? Or maybe I could mention that selling items for Rep is much less effective than one could expect (after all you're actively
selling), with maybe a 1/5 ratio?
And god made... So, I can shapechange a bank into a pocketwatch, stick it in my pocket and walk away with it? Would give serious consideration to keeping the same size, and possibly additional safeguards on this.
Well, changing something into a pocket watch was the exact idea. But indeed, it might prove too much a gamebreaker. Keeping the Size might solve this issue, true. I'll add this restriction for now and look at how it works on a playtest.
As soon as I can, I add these remarks to the class and update the file. Thanks a lot to you all.