Excellent work indeed, looks great. The time you've spent getting this right and also what would seem to be improving on the original design is really impressing me. Great idea about adding a logo to the braces too, with the cool original brass one all but hidden by the linkages anyway, that's got to be worth considering I reckon. If they are etched or cut in to the linkage, they can be left naked or even painted in to match the build or just simply to your liking. Loving the idea and your work.
Just a quick update on the bearing front. I've been advised that a bearing supplier is on the hunt for some, so once I hear back I'll let you know.