Clams or cycle fenders? Looked like a photo of the latter in your photo section, but hard to tell.
What color will the fiberglass parts be?
Acknowledging my profound bias in favor of Crossflows, I think the engine's basic crudeness fits the character of your car. It also makes a great sound and the modest power forces you to exploit its handling advantages. Also keeps you from getting too far over your head and beyond your skill zone, driving talent-wise.
As you probably know from reading other posts, the assembly stage is the perfect time to add as much heat insulation as possible, wherever possible. These cars run (really) hot and cockpit temperatures can be very taxing.