The article below about an interesting looking steam car might have some relevance for the possible marine side of PDX in respect of steam generation, details are a bit sparse though.
eg
"One difficulty was getting a turbine and transmission system in such a small space.
"But the worst problem was providing a steam generator to provide steam the turbine needed in such a small space."
INSPIRATION ENGINE SPEC
Two stage turbine on single spool
Output: 300bhp at 12,000rpm (turbine speed) (225kw)
Output shaft gear ratio: 4:1 or 4.45:1 to twin output shafts
Differential: Epicyclic type with viscous couplings
It is a method of steam production that seems not to have been used previously, according to Mr Bowsher. "