Then I did the math for a rectangular blank for the top guard, marked the pivot point on the boat and on the blank. I also marked both ends of the guard on the boat. I slid it up until it was kissing the boat at the high point and squared it off to the factory edge on the ply. The I scripted the curve onto the ply. Cut it with the little skill saw, and it only to a little work with the block plane and sandpaper to flush and square it up nice.
This was only a single 1/2" layer, so i used it for a template on another scrap piece and traced it. Cut it out, spread the PL Premium carefully and clamped the bejeezus out of it. Jim Specifies 1" thick ply. Once I glue and screw it to the boat, I can fair up any errors by checking the alignment of the slot the same way before I cut it. Then I'll use the inside edge of the slot to scribe the cut on the lower pivot guard to make sure they're dead parallel.
It was actually easy.












