Regarding the Sams 6AS5 schematic error, I got the Rider schematic, and it shows the correct wiring and voltages. The voltage shown on the Sams schematic are measured from a 110 volt line, so that explains why they're all about 110 volts too low.
I'll be ready to power up the set in a few days. My concern is how to set up the CRT off the chassis. I can't imagine trying to check voltages with the CRT mounted on the chassis. I made a connector for the yoke wiring from an octal base and socket. It has plenty of extra length, but it'll be easy to shorten it. The solder connections are insulated with 1/4-inch irrigation tubing which fits snugly but slides on and off easily.
The limiting factor is the six-inch high voltage line. I have some cable rated 40 kilovolts. The CRT is 15 kilovolts. Is it feasible and safe to splice 14 inches of that to extend the original 6-inch cable?