Altho there appears to be little interest in finding a more suitable/ scale looking canopy, I will post my finding nontheless: FOUND ONE!

As it happens, I have Bob Hollman 1/8 scale Hellcat kit (about 64" span), complete with 'glass fuselage and all the pre-cut parts. I am saving this kit for my retirement (in about 3 years).
I decided to get it out to compare to my CMP. Lo and behold: The fuselage dimensions are very nearly identical (within 1/4"?), meaning that the CMP is basically a 1/8 scale with an over size wing. Next, I got the canopy out. Sure enough, nearly identical in hiegth, width, and shape at the rear (bulkhead cross section). The Bob Hollman one is about 1/4" longer, which is fine as the CMP one looks too short anyway.

For those of you who don't know: Bob Hollman plans and kits are VERY scale authentic.

So, I have ordered a second canopy and fiberglass cowl (which also fits, but a little tight) from Bob for $45 plus shipping. May seem like too much money for some of you, but I am very sure that this will result in a much more scale looking Hellcat