Looking very nice indeed!
I noticed in the picture, which is labeled RE 500 No2 FAB rebuild 6.JPG, that between the cam spindles, there is no oil catcher or passage to feed the roller bearing from behind, like there is in the India-made cases. In the India-made cases, there is a drilling from above, between the cam spindles, and also a larger spot drilling at the entrance of it to act as an "oil scoop" for this oil passage drilling.
What's up with that?
Is that the way all the old Redditch cases were?
Maybe adding the oil drilling there might help lubricate those rollers?