Todd:
I won the article Cardinal, and it resides in my basement. A MAJOR help in making the airplane perform well is that the fuselage was covered entirely in 1/2 oz. fiberglass, adhered with epoxy. Keeps things real stiff.
Other than that, and some additional panels at the wing-tips, I believe that Bill and Noel pretty much followed directions and used kit wood.
They did substitute for a beefier, adjustable control system.....carbon fiber pushrods and ball links from Tom Morris.
The package does NOT have a "Pro-Stunt" finish, but a very workmanlike and simple finish which is perfect for profile models, especially for models aimed at competing at every level but top-twenty at the Nats.
Bill Hummel and Windy are both in the PAMPA directory and would answer specific questions.
See Ya