If Ilmor makes it I could very well be wrong.It looks a bit better supported than I could make out from the original photos. I would worry about alignment, but it's really hard to tell from here. generally, given the vibration of the system and flexure of the crank, a compliant coupling like a lovejoy elastomer jaw style coupler would be my go-to for a custom design, but if someplace reputable has engineered this, then I certainly can't validly criticize it from my living room 6000 miles away.
Not sure the Davies Craig pumps are good for salt water, although I expect they wouldn't be terrible.
Good luck, this is an interesting build!
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