Hi Ian,
Please let us see the rest of your collection hiding in the back of the photos. Most of these engines are R+D or prototype engines and are just screwed onto some varnished decking. I will take some photographs and post them later.
I have recently finished a prototype boiler for a stern wheeler and two modified versions of it are being made. So as a bit of a break from boiler making I fitted this boiler along with the engine mentioned above to a recently made mounting board. The engine is now finished from these earlier photographs.

And some of its pipe work lagged.


Alas I only had a small amount of Sterno so only managed a 5 minute run.
Video using temporary pipe work.

Regards Tony.