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I filled up the core in my case so there is no need to overlap the leading edge since the wing cannot split in half anymore. and it is a lot easier to laminate and keep the profile right that way.

I vacuumed 3 layers on both sides in one go then faired the profile and then added a last layer on each sides, it came out pretty good but not perfect.

the best I think is to laminate no more than 2 layers in one go,
use the bag and your release material to try to reasonably align the seam before it cure, it will help with sanding it.

Do not use kevelar fabric as it is a pain to wok with, I knew it but that was all I had left!