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, Hi!, Chip, Try this, I cracked one of my canopy piece of my AH-1W Cobra
I went to a Michaels store, and purchased a pkg. of self drying modeling
clay , one that dries hard overnight , I then took the master and set it on the
plaster to make a mold out of it , when removing the master , be very careful
not to distorted the mold , checked for smoothness and and make sure the
frames match, then let the mold dry. The next day I made a vacuum form
jig from this article
http://www.largescaleplanes.com/tips/RatoMarczak/jigs/vacuumform.html and made a copy of the original from 15 thou clear sheet and then clean the
copy with Windex and dipped it in Future and left it to dry overnight and the copy
turned out better than I figured. Give this shot, Good Luck!!!!
P.S. Walmart carries a nice little 4" box for the jig if you are doing small little
projects, for only a couple of dollars.