In my experience, Alumilite smells horrible and the resulting castings are brittle compared to Smooth-On and MicroMark CR300, my own preference. That engine does look really good - you should cast copies.
Great work! Strange how a glue bomb rescue sometimes can provide more motivation than a new kit. About the nose ... I'd be tempted to get away from the early Camaro look by giving it something like a mild Ferrari shark nose, building on the chin it already has, with the upper edge forward of the lower.
I apologize and will attempt to delete this post if you weren't serious, but, here goes:
From left, I call them Cobra Daytonish, wide Cobra, Cobra Bread Van and Cobra Crate. Couldn't resist including helper cat photo. Enjoy!
Great start!!! Outrageous originality! Hope you can blend in that roof - looks like a challenge to me. Show us the chassis, please. BTW, I have some pretty "stupid" Cobras going myself.