Back to building: I cut the openings in the front of the center spar last night, and did some prep work for the final 2-uni layup (and yes, I bought a gallon of EX poxy with the 87 hardener). I tried to use a Dremel sanding drum to cut down the foam along the edges of the holes to make the glass-to-glass mating, but cut through the inside fiberglass. I had just gotten started, so I stopped and decided to ask for some advise before I make a mess.
One thought is to just go ahead and put on the glass cloth, let it cure, and then make flox "corners" between the glass layers. Seems to me that since it looks like things are going to go in and out of these holes a lot over the plane's life that the edges of the holes will take a beating.
Or I could stick to the plans and maybe use an X-acto knife to trim away the foam, and then gently sand down to the bare glass.
How did y'all do this w/o taking 3 days?