That paint stand is like a jig that was previously posted in a magazine years ago(I forget which). However, you made it out of pvc and it appears to be an excellent upgrade! I will be sure to copy it.
The original had an additional arm to hold the wing. It was made of wood and attached to the wing at the aileron servo plate(Remember using just one aileron servo?).
Finishing a pattern model leaves one with a multitude of questions. Film is the lightest(unless you can finish an airplane the the U/C stunt guys!). However, I used to use K&B clear to attach the 3/4oz fiberglass. Then, Superpoxy primer,sanded off and the Superpoxy color. Silk and dope produced lighter finishes but have you priced silk and dope lately?
I got around that by buying Randolph clear and thinner from Aircraft Spruce and then 5mm silk from Dharma Trading. The urethanes are great if you have the safety equipment to use them. Painting a pattern airplane is my favorite method but use anything that suits you.