Scottabe
Your build looks just fine, nice job.
Canopy masking can be a real chore when getting started, for the longest time I just brush painted them, results were not terrible, but the weakest part of the entire build. Then I read about a procedure that really does work for me.
I use a variety of tapes, two of them are "blue tapes," commonly used in household painting I think. One of them by 3M, the other by a company called Duck. The Duck tape, (not to be confused with Duct tape,) has a fine edge, thin and easy to cut, the 3M is thicker and more effort is needed to cut it, but still has a fine edge. The Duck tape will definitely allow a tighter curve, when masking curved frames Other tapes are Tamiya and Frog, Frog is available in paint stores. (I'm in the U.S.)
I place whatever tape and length I'll use on an 8X10 glass plate, using a metal straight edge I cut it with a curved X-acto blade into strips as thin as I need to get, The thinner the strip, the tighter the curve you can make. Once the frame edges are masked, I fill in the adjacent area with either more tape, or liquid mask. All of these tapes mentioned are of the less aggressive adhesive, very little tendency to lift paint from the surface.
A little experimenting will demonstrate whether you like the method or not, it does work well for me, it's my only way to do it now. I hope you find this useful.
Patrick