Success!

I parted the canopy from the mold with my usual anticipation. As with any molding job like this with deep, steep sides, getting an initial movement of the plug (in the case the original canopy) is the hardest due to suction. A steady prying from both ends and the canopy came out quite easily. (The best process for parting rigid plugs that are having trouble coming out is air pressure by the way – but that was not an option here.)

The canopy is in perfect shape and the mold is just fine.

Next step is to cast a canopy plug for vacuum forming