Thanks for your thoughts, amber.
Yes, bonding the lams together is a possibility. Not sure what the core insulation coating will be, yet, though... The core assemblies will also be coated in epoxy, after machining.
To be honest, I hadn't envisaged that the cores would need any more than the dovetail to secure them to the plate. I'll probably put a spacer in the exposed outer end of the dovetail-way, too, though.
For bearings, probably 2 radial bearings and a thrust bearing or maybe some sort of angular contact or tapered roller bearing. Need to find out which way is the least lossy....