Took longer than I had hoped but I'm glad to report that v3 of the board design is complete. I had to modify the original design to support the new relay design (since the OEM is NLA), and then add a daughterboard to support the 6 spade connectors.
The photo shows the mockup of the board using paper. Its a decent way to sanity check measurements. I was off width by 1mm and height by 1 mm. Height isn't a big deal but width is since the board fits into the aluminum box.
Sending out design tomorrow!