Rear spoiler / kamm looks great !
Thought I would mention what to expect for springback after glassing if there is some tension in the foam . Short answer is not much if you glass 1 side and let it cure . Next to none if you could glass both sides and let it cure before releasing the supports.
My roof was 2" thick ( no kerfs and pretty stiff ) and I was looking for about a 1" crown/camber over 8 feet. So I just guessed and forced in in 1 1/4 " crown with clamps and glassed 1 side . Springback was 1/4 " . Then I turned it over and forced it back to 1 1/4" and glassed the second side. Springback was 1/8 "
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