Well gents, I made the leap and cut my tubes tonight. I used the bolt-in-the-bench method to figure out what length the tubes needed to be cut to assure the 69 9/32" total length from the rod end to rod end.
It appears that for my tubes, 66" of length, maybe 65 15/16", would be the ideal length. This let me thread my rod ends to the halfway point on their threads, AND gave me 1/4" of clearance for the rivets in the VA-111 end joint.
I detail it here on my blog post: https://theskunkwerx.com/rv7/aileron...-tubes-part-2/
Really happy with the way they came out for now. I hope that 69 9/32" is the exact length we need. I am only halfway on the threads on each heim joint / rod end so there should be plenty of adjustability.