If one has the knowledge skills and tools to swap out a gasoline engine for a diesel in a boat and have everything line up and work perfectly, his time would be better used doing this for other people. You can't just take a crane and remove the old and install the diesel, there are many, many things that would have to be changed.
As for resale value, a "homemade" engine swap of this magnitude would be a big warning for anyone who knows anything about boats. If you're going to do this you should have it done by a reputable boat yard that specializes in repowers.
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