Was thinking of making one to dual wield rapiers. High damage and high crit chance.

I had a play around in the character tester and managed 70AC unbuffed and 45AB (not the greatest). With 10 attacks per round and 9d6 sneaks I was hitting for 120 with +5 rapiers.

Has anyone made this build? I'm sure it can be done way better than what I've done

10 attacks/rnd doesn't sound right?

Seems a worthwhile build though, potentially.

Yeah ummm no, that's a number I pulled completely out of thin air, I have no idea why haha.

4 attacks mh 1 offhand - I'm sure it could be 4/2 ??

Yeah 4/2 if you have 15 dex for imp 2-wep fighting. And you could get another with a crown of the db. Though with this build that would decrease your AC I think (Int penalty?).