George. What arm length do you have? I have 1.5" arms. Its set up smooth, so probably about as ours.
Yep, I added a 1/4" ply X brace that extends 3" into each panel. Its just to stop the tube crushing.
Did I say to add raised ailerons? I have 1/2" raise ailerons for landing on our sub 300' grass strip

Bigger fan on the front will hopefully add more drag