For a canopy try ParkFlyerPlastics.com . I've bought a few canopy's from older Sig kits that were long ago discontinued. They have several styles of canopys on their website too. Some specific to particular planes, and some more generic canopies of different sizes. The products I got from this company are really nice. I have no complaints at all. Send them an email if you're interested, and they might be able to help you. It's what they do.

FiberglassSpecialties does have a few canopies listed I've noticed lately as well..(maybe where you sourced your cowl/wheel-pants).

Either one of these companies, or the above that carl listed might have something close that you can retro-fit too. Just a thought there. Good luck with your project.