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That sounds like she hardly will be loaded more than a bit above idle, so to speak Since a diesel usually likes to work and it won't be do much of that, I hope that there is a thermostat in the cooling system, so she at least can reach a decent temperature .... she probably do not need more than the Ø1" x 3' condensation tube on the outside of the hull, I saw on some steamlaunces in Scotland in 2012.Oh and I'll admit that did absolutely not appear on my "radar", that she would need a much smaller tank than what is available in the business, before you mentioned it ....
Looks good Mike
Dave,A jaw coupling with a rubber cush insert would be a good choice. Plenty on e-bay or AmazonMike
Great project Dave, that seems to be going well so far. I'd be interested in the measurements of your boat. Did you build her? Also some pictures from back in the steam days.Jim