Using a Ridgid quarter sheet sander and Diablo 80 grit sandpaper, machine sanded the areas of the hull that were beneath the boat stands. Hand sanded the areas of the rudder and the counter that are not machine sandable due to the compound curves or tight radius of the curves. About three hours of work combined.
In order to free up space to work on the thruhulls beneath the galley, removed the drain from the sink its hose and its ball valve. The 1" ball valve is broken. Handle turns but the ball is frozen in place. Needs to be replaced. Removed the Newmar ABC123 15 amp battery charger that had been installed using the upper mounts which were attached by screws to the shelf beneath the stove in the galley. Not a good installation. For the moment the charger is sitting on the port berth. May relocate it to a temporary position to port of the icebox, running the wire from the back of the battery behind the icebox to the charger. To be determined. Now that more space was available, used a cold chisel and hammer to remove the remains of the plywood backing plate for the galley raw water intake. Half the plywood had come away with the pipe used to form the "thruhull", the other half remained attached to the hull. After removal, machine sanded the area to expose glass to accept epoxy and fiberglass.
Removed the head raw water thruhull. In order to get space to work, removed the door to the head, 8 philips head bronze screws, replaced in door jamb for safe storage. Door currently in the forepeak. Significant difficulties removing the hose from the thruhull and the head pump. Neither came off easily. In pulling on the hose connected to the head raw water thruhull, the thruhull and its plywood backing plates separated from the hull. The hose was still attached. Removed the hose from the 1/2" ball valve for the head raw water intake. The underside of the plywood was pasted to the hull using some type of adhesive. The hole in the hull is 1" in diameter. Appears the same adhesive was used to fill the hole to match the outer diameter (shade less than 7/8") of the 1/2" "thruhull". Just like the galley raw water thruhull, this one was also a piece of pipe and washer friction fit together. There is somewhat more than 5-1/4" from the inside of the hull to the underside of the platform that supports the head.