Just wanted to refresh this line of this thread because I unsurfaced this while digging through Sport Maska (CCM) patents on Google Patents:
Here's the patent, Skate and method of manufacture, from 2014: https://patents.google.com/patent/EP2932864B1
That's the closest I've found to an inside look at what could be an indication of how CCM's OPBs are made. It's the same mold form I was envisioning creating that seam trace you can see along the middle of the shell.