Good to see you TBone. Yeah, slowly but surely we're picking away at the tasks.
Over the weekend for example, I created a template out of 3/8" plywood, clamped it to the bottom side of the engine hatch, and used the router to remove a rectangular section of the hatch core while leaving the 1/4" thick skin. This was necessary in order to properly repair a 4" diameter hole the PO had cut in the hatch to attach a fighting chair, and a 1.5" diameter hole they cut to install a pull ring.
The pull ring never needed to be cut all the way through, just recessed a little. The 4" hole, which had been directly over the carburetor/spark-arrestor was the reason the original motor filled up with water.
After removing the plywood core (rectangular with rounded corners) -- sorry, no pics, it was miserable outside this weekend, mid-90's with extreme humidity -- I ground the back of the skin to solid glass.
I prepared a piece of new 3/8" plywood to fit the void, and laminated 3 layers of 17 oz biax and one layer of 10 cloth to one side. That resulted in a 1/2" thick plug.
Covered the holes on the outside with masking tape, and filled from the back side with thickened resin (epoxy and cabosil) and then buttered the fiberglassed side of the insert and pressed it into place. Filled the minor void between the existing core and insert with PB and smoothed.
I will later grind the gelcoat on the bottom side surrounding the patch, and lay a piece of 10 oz cloth over the bare plywood. There was no glass on the bottom side of this hatch, just gel over bare plywood originally.
On the outside, I will use the die grinder to recess the area for the pull ring, and will also take the area of the 4" hole just slightly below the surface and feather it our to the surrounding area, and lay some cloth in and fair over it.