Having the old Atkins vacuform handy has helped with fitting of the canopy parts! Atkins provided a very nice set of drawings with their instructions and I used these, and the Monogram Airacobra, to achieve the proper angle of the forward transparency. This isn't the greatest fit in the world and took quite a lot of trial-fitting to finally get a good shape and fit:
MPM P-63 Kingcobra
Still some slight adjustments will be required, but only after the fuselage is glued together and seams filled.