do you have some rubber grommets for those through chassis holes?
Yes, you can see where I've already installed them for the OPT wire holes, I just haven't put them in yet for the external cap setup.
I can't stare at that corner of the board any longer.
stare at the schematic, start with the tube pins indicated in the layout, you'll "see" the fog lift 
I understand how to wire the amp. I had it wired correctly with the filter cap board inside the chassis. It's the weird area inside the
blue rectangle in my attachment that I can't decipher!

Everything should start with the wire from pin 8 of the GZ34. It should go
straight to the positive terminal of the
first filter cap. The red wire from the OPT should also connect there. The tremolo plate - second plate of V2 - is fed from that node.
The second node - positive terminal of the
second filter cap - supplies pins four of the 6V6's.
The third node - positive terminal of the
third filter cap - supplies pins 1 & 6 of v3 - the PI tube.
And, the fourth node - positive terminal of the
fourth filter cap - supplies V1's plates, and the first plate of V2.
All that I completely understand. It's the area inside the blue rectangle that makes no sense to me.
So, I'm just going to ignore that "doodling" on the original schematic and wire the board as I described above.
