I'm very interested to see your pictures. I hope you haven't given up on this idea.
One concern I have is to the cost of the turbine and the safety of the high pressure connection between the boiler and the turbine.
Have you considered using an existing motorcycle engine with the intake valve blocked, a standard fuel injector in the sparkplug hole to feed water rather than fuel, and the exaust valve modified to stay open until top dead center (to avoid pressure during injection). If you apply heat to the head (the fins make that easy) then you should be able to get a nice burst of steam inside the cylinder (designed for high pressure) on each water injection.
That should be easy to try. Just open the head and snap off the intake valve stem with a hammer or grind it down, then adjust the timing so the exaust valve closes much later and grind off part of the exaust cam so that it opens at the same time. Bodge some way of inserting the fuel injector into the spark plug hole and wire it to fire at TDC.
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