Terry, after all of the fine help above, it does look like the ejector system is an evolved Perke's patent. You have a very interesting gun.
As to the Richard Ellis marks, Ellis was the one who made those Winchester marked hammer guns, too. I have seen other guns with the Ellis mark on the barrels and sides that were the Anson and Deeley from Westley. Whether or not W R started the gun, or Ellis did, I am not sure, but with the WR mark on the barrels , it would seem to have been in the hands of W R . It is also thought that , at least the lower grade Westley Richards droplocks were products of others [Webley and Scott].