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Looks good to me, after all, its the end result of taking pictures that's the most important, right?
I rethought the idea of using the original wide rear element holder in a C/Y adapter becasue the fit is so close, but if properly positioned, there is no room for a AF confirm chip. Then, your assembly looks like it is more flush with the EF bayonet ears of the adapter, allowing possible mirror clearance on a stock mirror and clearance for a AF chip? But, the rear element is so far away from the mirror/sensor, the main lens assembly will contact the rear element before the infinity position is reached. So, this begs the question, does the lens focus to infinity?
The general layout looks similiar to the nFD lenses, but the mechanics are a lot different. For example, all versions have an aperture finger to control the iris, but size and shape are all different. I guess the breachlock lenses were more prototypical in the line toward the nFD mount. I had the nFD85L, nFD50L, and nFD50/1.2 all going through conversion at the same time. The backs were identical. The grey cast metal ring that controled the aperture was identical. The black plastic aperture rings were identical and in fact interchangable. They all had weird thread screws. The difference was the aperture fingers. The 85 had one tab, the 50 had 2 tabs. The 85 rear element screwed in from the outside, the 50 rear element screwed in from the inside.