Refitted canopy to canopy frame and attached to airframe. Marked rear edge trim lines. Removed canopy and trimmed then refit to canopy frame. Fit rear window and marked trim lines for canopy fit. Removed rear window and trimmed as required. Refit rear window and clamped in place. Drilled holes in canopy at marked locations and clecoed. Countersunk holes in rear window at rollbar.