Does anybody here have any of these controllers?

I'm thinking of picking some up, but I don't really want to keep them as is. It seems like the reviews are so-so for the D-pad and on the actual shape of the controllers. I'd like to gut them and put everything into an actual SNES controller.

Has anybody hacked these apart and put the wireless guts inside of an actual SNES controller? Just wondering how easy it would be to do or if anybody has done it successfully before.