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I'd have to say, if I wanted a diesel I'd do a diesel swap. Even if the head studs and whatnot aren't an issue, I'd want the high C.R. of a "real" diesel, and I'd want the chamber/piston design for direct injection. Also I'd want the high-nickel block that I understand most if not all "real" diesels have, to enhance cylinder longevity under what has to be more stress. The mains bosses, crank, rods, etc. are tougher too...? A lower C.R. diesel conversion can likely be made to work but- speaking for myself- I don't think I would have the patience/resources/skillz to dedicate the R & D necessary to come up with an engine that matches a factory unit in efficiency and/or longevity.
Unless the homebuilt unit could easily beat gasser efficiency...
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