Just an update - we only had to trim about 1/16 off the aft canopy plexiglass and not all the way around, just in a few areas. I used the cabinet scraper method then re-bezeled the edge with 180 grit sandpaper on a sanding block, turned out nice.
The sides of the plexiglass fit nicely, the front squares up on the template's line nicely.
We're doing the chamfer(s) today hopefully.
Really, unless we run into something unexpected, the fitting was trivial. I expected it to be a big deal, wasn't.
#140376 RV-14A QB IO-390 Thunderbolt