I ordered five backplane PCBs, and received them on November 27th. They turned out really well, except I did not leave space for the screw mounts on the ends of each JAMMA edge connector. The solution involved cutting the screw months off with a hacksaw, but the end result was the first two backplanes soldered and 100% tested.
 

My soldering skills are pretty low, but the results turned out okay. The zoomed in shot shows the 6-lane breakout point for two of the connectors.

Downloads

Baclplane 1.1 Gerber