Over Christmas, I put these two amps together.
My new mint, I put together in 1 evening, case work and all:
It has the 8620 with the 634s and has been biased into class A using the CRD. I also used a 220Ohm resistor for R11
The PPA took a lot longer:
I added the Bass Boost, and the crossfeed. I'm probably going to get a new volume knob, and another switch to make all three switches identical, but it's working great.
I used 6 of the 5002 buffers and the 8610s
The most difficult part was the crossfeed. It had 16 wires and it was large enough to make mounting difficult as well.