Good work there H.
Make sure you keep test-fitting, and it might be easier to fit the canopy once it's masked, then paint it. Very small spots of superglue should hold it in place, then run a bead of PVA or Micro Kristal Klear around the joint, as with the Mustang clear parts, doing it the same way, repeating the PVA if required. Let the canopy set for a good 2 or 3 hours at least, then do the painting.