Ok, this had to be the most difficult part of the build yet. No kidding its just a crotch strap, but what a pain in the Arse! First of all the holes were not pre drilled in the quick build, so finding an angle drill that would fit was difficult. its not perfect and we are not even going to use the crotch strap but I feel more comfortable knowing there is a little extra reinforcement between the longerons in the floor.