I have read all the post I could find on the TF P51 60 ARF. Understand a lot of folks have switched out the retracts for whatever reason. My question for folks who have been flying this bird now for a while is concerning how well the airframe is holding up? Have there been any weaknesses identified that I should look into as I build mine. I will be installing a YS FZ91 and 6XES Futaba radio. Thanks.