After the expensive cock-up of cracking the last canopy, I started to cut the new one, with considerable trepidation!. I left the canopy out on the driveway (black slate!) and the temperature inside the bubble was 104 degrees when I started cutting! Used the old canopy as a template, leaving an extra inch for second/third trimming later. All went fine again, so canopy drilled and clecoed to the frame for storage overnight.