You'd need a certified engine for starters to fly over anywhere buillt up, after that it should just be excess paperwork and inspections.

Don't know if ASRA can do it?
Looking at the regs for the driver, there is provision for commercial gyro licenses. Again I'm not aware of anyone having one as we don't really have the OK for commercial operations, so some sort of contradiction on that. Is our current gyro license in line with a PPL?
Dave