Hi Aeronaut. I built one a few years ago. I read all the posts here that Icould find. The one thing that a lot of the guys said was that there is a lot of twist in the tail. I added diagonal supports to the stringers and fibreglassed the tail from the rear of the wing back. Seemed to help as the control was fine and it still weighed in at 9lbs ready to go. Good luck, Tracy.