reversing that supply bypass cap is a very bad idea. if you are lucky, it won't explode. tiny bits of al foil and greasy paper all over the place, and your pedal won't sound any good. put a new cap in the right way round, with (-) to ground.
the cap on the led is also bypassing any noise it might generate to ground. don't reverse that one either.
post in the building your own stompbox area will get most looks.
