My dad & grandad made P40s at Curtis Wright during the war. We had quite a selection of cable pulleys for years after to rebuild double hung windows. They would last forever and never made a noise.
A very nice model, Joe.
For canopies, I use hand cut masking tape when pre-cut masks are not provided in the kit as my hand is not so steady on canopies (the chance of smudging a transparent part makes me very uneasy and nervous while I'm much more confident on belts, straps and so on)
With your next build it should be easier to try to mask the canopy with hand cut masking tape as Tempests have a simpler canopy than P40s.