So here it is, scrapping every idea previous and future... i made a template Skeleton structure of thin woodstock (same as the underbelly structure for the rear diffuser). Having (not) failed, but crudely constructing various Kamms on bare cheapness.
I'm sticking to what i know and am good with. WOOD, this only weighs 3lbs and is most perfect in 1 take!
I'll Just leave these here
The pieces cut from the window brace boards were reused for the top contour
Doodling
Cutting
Fastening together
Proper angle finally, and symmetrical
Darkness came with the quickness, so i had to wrap up
So there we have it...
Im going to lay a panel over it soon and use it until i can lay some fibreglass. I still have a large usable polycarbonate panel for possible window after glassing [EDIT: we will see how well the grill works as a heat-oven for molding]
[EDIT: covered my skelton with thin 1/8" flimsy plastic poster board, zip tied it, used a couple old License plates for rigidity and crappy shape but works]