Looks good. I tried to help by finding photos of the C1, particularly rear and side views. I've attached what I found. The-Blueprints.com does have a four-way of the C4. I'm wondering about the rear fenders: the C1 appears to have blunter-ending fenders than the C2. Perhaps similar to an early Vette.
That was not easy. The can doesn't say what it is (other than listing the nasty ingredients). The website doesn't even list the high gloss black as an aerosol (they do carry airbrush paint) or what type of paint their products are. Amazon does identify it as a lacquer.