Yep, I will have to pot it in place to really get the fit correct. After the fuse is glassed I will cover the hatch area with Monokote and then wax. I will then put down a couple layers of 3.7 oz cloth to form the bottom of the hatch to an exact fit to the opening. I will brush a paste of epoxy and cabosil on the bottom of the hatch plug and put in place. After the epoxy has cured I can do the final sanding and then actually glass it into place. Once that has cured and gets blocked out, it will be cut free and then will be a perfect match.