Well, even though there is a great similarity between the engine under consideration and the overall design of the Wigzell & Halsey, there is significant differences with the actual valving as compared to the Wigzell & Halsey's coned concentric rotary valve. The engine in question appears to have a non-concentric valve system based on an eccentric disc that "wobbles" around alternately covering and exposing the ports, while the disc also has an inner relieved ring that does the same thing in the opposite timing. I would suppose that judging from the coned shape of the eccentric valve disc, that the steam pressure should come in through the backplate line that is parallel to the crankshaft and enter the ports when exposed around the outside of the disc, while the exhaust would then exit the ports into the hollow ring on the underside of the disc, and be vented upwards and out perpendicular to the crankshaft.
One thing that threw me on initially viewing this engine was the lack of obvious steam channels or lines leading to the top of the cylinders, and the clean cylindrical form of the cylinders themselves. But I did suspect the possibility of the actual cylinders being offset within the larger cylindrical bodies, with the steam channels routed up the thicker part formed by the offset, somewhat like my Cheddar Westbury cylinder is done, only different.
I rate this as a very interesting design concept, but think that the friction of the eccentric disc and the sealing of that whole portface surface would be somewhat problematic.
Not to say that it can't be made to run of course, but I can see where it might be a bit difficult getting it to do so, though most certainly worth the effort to give it a try, as success would be most gratifying indeed.
Oh yes, and I must add THANK YOU John, for going to the trouble of exposing the innards of you engine so that we might see a rather new and interesting arrangement, at least for me it is!
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