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MarvHucker
It's not my boat - belongs to a friend of a friend. He, however, is going to cut it up and bin it as he doesn't have the time to fix the corner. I've said I'd be interested in fixing it in order to use it to practice sailing in something with a bit more keel than the dinghies I've been using.
The rotten wood was confined to an area roughy 0.5m3 at the rear left of the boat - not normally an area that gets a huge amount of stress but this boat is designed to heel, then (in 8 knots+ of wind) rise out of the water and plane on the chine (side) which runs all the way to the back.
However, it's a corner, so three sections coming together which, with a bit of reinforcement means that I think I can get the strength back in there.
Back to the question - the epoxy is stronger than the wood, and when thickened is very happy to fill up quite large gaps. So! Do I want to make my gaps tight (minimal epoxy) or loose (lots of epoxy)? I'm tending toward putting a bevel on (as mentioned) purely to get more glue in there.
Usually small skin on frame boats are built using scarf joints, but achieving neat, precise scarfs on curved panels in situ is, I think, optimistic.