Joe:
Make a new plan, Stan?
No tall rib. I would post a pitcher of what I have in mind, but Photobucket won't play nice with my computer today. In any event the rib will be based on true events, as accurate as I can replicate it from pictures of an original. Thanks to the generosity of a lurker here, I have some very good pictures to work with.
There are a couple socially acceptable ways of shouldering the recoil. The hole in the rib ala Smithson in the picture above is one. I might be inclined towards two smaller holes with mating pins in the bottom of the rings. Setting the rings down in a shallow mortise would certainly work, but the visual impact is a little greater than I would like.
I will do a little more poking around. A letter to Warne inquiring into the dovetail sizes of their grooved receiver rings is next.
Thanks!
Glenn