i have built a simlar hood and have a simlar problem to you?
my front flap doesnt close all the way lol! it was a problem when i fited the hinge it just wouldnt sit right and i found that prolly the hardest part
yours looks better than mine tho =p
Yeah was a bugger to close! Got it to close properly by taking out a few screws seemed to work. But I am sure that the varnish has made it curl up. Best thing to do is measure, measure again then cut. It help i had access to a basic carpentry shop so my angles were spot on even when my measurements were not.
Learnt a lot of lessons and next one wont be so expensive, big and time consuming!