I think I have a "mostly populated" GSG board stashed away in a box downstairs, will check. As I recall it was mostly complete, lacking only 3 of the two-terminal blocks and the cathode resistors for the 6B4Gs (I typically used Dale "heat sink" power resistors mounted off-board).
Apparently I can't send IMs now (pinged Shannon on FB to see if there's anything he can do). I do want to buy that GSG board from you. Please send mail to me at derek_vanveenAThotmailDOTcom.