Wouldn't it be cool.........hybrid?

I'm not sure if anyone has done this before but over the last year and a half I've been contemplating building a china girl build and the front wheel would be one of the electric kits available where the motor is built into the hub. The idea is the bike could run on gas OR be electric. The engine would somehow charge the battery(possibly utilizing the white wire) I've been thinking of ways to make it work. Of course, I'd make it look good Let me know!