I just glassed 2 pieces of 3/4" plywood together and dry fitted it all together first. Wanted to make sure all my clamping was going to work. Whipped up a big batch of peanut butter and slapped it on the transom and plywood and clamped the whole thing together. All the excess squeezed out and filled all the holes that are there. Anything that squeezes out the back, wipe smooth. The pod is going to cover most of holes and your still going to have to use some of them, the tie down hooks, rigging holes, fuel vent, trim tab line. Anything below the water line I drilled and than drilled from the inside back to the glass over size and filled solid. Then redrilled from the outside in the size I needed. I filled the collar hole, but there are guys that don't. I looked at it the same way in the fact the boat lasted 40+years built with polyester resin and plywood and in some instances bad building practises and still floated. Built the same way the boat will be here another 40.