This is where I am, at the moment.
There is a 1mm recess in the can which restrains the core modules in the axial direction. The collective wedging action against the core spacer strips (green) force the modules radially outwards, into the recess. I'm relying on the integrity of the lamination bonding and compression from the winding. I could also wind a layer of Kevlar yarn around the inner section of the core modules before epoxying them.
Will this be enough???
The coils will now be linked on the inside
with circa 12 gauge wire, to avoid impeding the air flow.