On your end, I would not worry about the cracks. The engine has been making some serious power without cam or oiling issues since getting it sorted out in the beginning.
Basically, they can’t get any worse.
On Ritter’s end, the casting needs to be changed to a solid bulkhead. It can be gun drilled later to make for a more robust block.
As far as cam bearings moving, even the A8 I have sitting here with 55mm roller cam bearings has retaining screws to assure they don’t move out of the bore. Maybe because of the aluminum block? I don’t think roller bearings tolerate a lot of press fit without the finished ID changing size.
Good luck with whatever direction you go.