I had mounted the adapter plate and flywheel but I'm experiencing some clearance issues between the automatic flywheel portion and adapter plate.
Looking good:

But the adapter plate contacts the automatic flywheel ever so slightly.
The new flywheel bolts on top of the automatic flywheel in order to retain use of the crank position sensor pickup and ring gear.
I had not removed the automatic flywheel when first installing the new manual flywheel and adapter plate, but ended up doing so while troubleshooting the clearance issue. What I found between the automatic flywheel and crank was a spacer.
I removed that spacer and reinstalled the flywheel and have just the right amount of clearance between the flywheel and adapter plate. I still however heard metal to metal contact when rotating the assembly. Again, everything came apart and this time I found some witness marks on the OM606 oil pan.
I'm out of time this morning but I think if I remove some material from the witness mark area on the OM606 oil pan everything will fit.
I reached out to DiselpumpUK to verify the installation procedure as I have no documentation. I'm just interested in confirming if the spacer is typically removed.