(I forgot to take a photo of the gelcoat - the first coat of clear epoxy

).
A strip of this stuff is cut out.
So here is the "inside" layer of carbon. I cut it a bit wide ... shouldn't waste this stuff at $50 a square meter

.
Now it's a matter of adding lots more layers, probably eight, or ten should be strong enough - about 2mm, maybe 3mm. I've got some ugly 400g (that stuff is 200g twill weave) carbon that's better structurally and builds faster.
Then I can pop it off and do the other side.