Thanks again for this thread Tom.
I removed the drive side cover by hand, it had resistance but popped out. The black moly grease on the secondary reduction plentiful on this new/unused BBSHD, can see the other grease referenced from what's visible.
Now I'm seeking any tips for refitting the drive side cover
The bike is lying down on its left/non-drive side with the non-drive crank/pedal attached so axle isn't going to fall through.
Putting the drive cover back on, I've tried spinning the secondary reduction ring gear hoping it will engage with the pinion, light hand force around cover, while rotating the ring gear. It's partially engaged with the pinion edge but not sliding further down. Not yet engaging the locating dowels, about 2mm gap from them.
I can see the pedal freewheel pawls and teeth on the inside of the cover, wondering if they're stopping it as I read on your further disassembly/reassembly, but I can't get anything to the pawls with the ring gear in the way.
It's a full moon staring at me through the window with some sweet moving cloud so I'm going out for a ride on a pedal only bike and do some howling at the ancient e-bike gods
or hope someone can point out a real basic step I've overlooked