Awesome setup Daniel.. i'm slightly jealous of that lot
As you know i have built my own test rig that does several of the early SS boardsets,
Gtb sys 1 driver board
Sys 1 displays
Stern/Bally lamp driver
Stern/Bally 6 digit displays (plans have been made to modify to do 7 digit displays as well).
I like the WPC test rig you built
i might look into doing something like that one day