Hi Chad!!
Blown up to 68-72'', is the KI-61Jr going to have enough formers/structure to be sound (in the wings especially) ? Also, what flies well in one size doesn't always do well as significantly larger size without some modification of other things as well.
What did you use for plans on your scratch built Tony? As I recall it's in the 6' range isn't it? Done a canopy yet.......or paint?