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I didn’t but I do have a side on photo which might help.
The hub is the same setup as the one supplied by Merlin (OEM axle plate, solid axle).
There are no speed bones or anything required -the post mount disc brake mounts to rocker dropout, torque is anchored via that little support plate you see at the bottom of the drop which is part of OEM axle plate.
Arrangement looks similar to cube dropout, except for UA rocker / cube sliding for chain tension adjustment.
I’m thinking the OEM axle plate that Merlin is supplying might be ok for use with cube. So no new axle plate needed. See urban arrow rear dropout arrangement with Rohloff:
solid axle, OEM axle plate , post mount disc brakes, long vertical dropout. No torque arms, speed bones etc needed.
The dropout needs to be long and stout enough though on cube for this to be the case. With wheel fully sat in, that support block on OEM axle plate replaces the need for any additional torque bracing.
Cube specs need to be double checked against Rohloff manual (which is quite comprehensive) to be sure.