So to summarize: -
Glassing up the hole taking really great care to do the correct taper, ensure the resin adheres, cut and lay in the correct amount of skin irritating glass, let it all cure, sand back on both inner and outer surfaces, prime both sides, apply topcoats to match the existing surfaces, paying for the shore time, and resin etc. Face/dust masks, a heap of power tools, clean up solvents etc.
Asking friends if it looks OK. Feeling possibly a little emotionally insecure about the repair quality and constantly checking it over the next few years.
B) The hole already exists. Clean the two surfaces. Buy the largest quality skin fitting, valve and cap that fits the existing hole (later you can reduce the plumbing
sizes inside the boat
if needed). Install it with proper sealants. No grinding, no resins or glass no extra painting. Later, you, or a new owner will always have the option of using the fitting for some unforeseen purpose. If you are dealing with a buyer, you can gently brag that you put the fitting in to provide the buyer with options. What a thoughtful guy! With the valve installed any new use can be done while the boat is in the water
. No lift
out required. Big savings all round. More money
and time for beer
Bloody obvious to me.