Phil,
My 1/2A Brodak Pathfinder weighs 12 1/4 oz (could be a little lighter) but handles the weight well with Norvel .061, 48' lines, ~ 4 sec laps.
I think it is the best 1/2A I have flown to date, will be interested in your Twister project.
FYI/reference:
Pathfinder specs: 35" span, area=236 in2, fuse lgth=27"
Roger V.
Merritt Island