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The easiest is the traditional way of having similar horizontal surfaces that you fix with rivets and glue together. If you will use CNC production for the plugs, you can as well go for the shoebox solution which has to be more accurate. Same thing, glue and rivets or the screws/bolts for the rub rail. Between 50 and 70 mm overlap is enough on this size of boat.
The special glue today is usually stronger than the GRP, but you can add a layer of GRP inside if you have access.
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