[MrFixr55]

Chip, re your question about B-, note that B- does not connect directly to ground. It connects through a resistor to ground and via another resistor to the grid of the Audio Output tube. this is to provide the required grid bias, instead if using a "C" battery like older farm sets (like my RCA 5BY and 6BT) with more audio power did. Note that A- does connect to chassis ground. I don't think that the relatively small mismatch is gong to make much difference.

Congrats on your progress so far! Keep plugging along. I wouldn't remove the engraved plate from the radio. While not original, it is part of its history.