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Just out of interest, where did the castings come from & are they still available? (Strange that there wouldn't be some plans+castings combo arrangement made, but I don't really know anything about the situation or rights etc.).
I thought that the engine which was modeled By Mr. Chenery was the one at Old Warden, but if you compare the models or drawings with that engine (photo attached), you can clearly see that they are different (count the fins). Is there any description in the original magazine article which speaks to the differences? Casting the cylinders with the original fin layout at this scale would be difficult indeed, unless by investment and I wonder if that was the reason the number of fins was reduced - or was it a different version that was modeled?