Thanks, Dennis.
I figured out the shaping pretty much as you told, spent so much time (but educational!), made good fit, then decided to change to easy round frame with 14gauge round wire because I plan round shank as well. I stopped on that point now thinking what frame is actually better, and so far I like them both. and playing with aluminum wire.
It also supposed to be my first etching attempt. It will be easy since I don't need to learn that on my own, I have professional circuit board maker at home