I hope ur ready to run around with a couple of huge flaps of tisse (50ft x 4.5ft each) folded up rather precariously against ur back. Oh, and, what about structural support? The bone system would be hideously complex for the sake of management and storage. Now, you will have to dedicate a large part of ur brain to controlling your new motor functions.
But yeah it's a cool thought. But seriosuly, considering that an aileoplasty would probably cost a tonof mney, ask yourself this: why not just get a hang glider???