Well got this one going without the schematics after all (even a blind squirrel?) It was the tilt re-set relay where the ball drains, there is a small gate as the ball drains, if there were a tilt, this gate lifts and activates a tilt reset somehow. When I manually lift the gate or activate the switch - the game starts. (So for now I've just placed the actual switch level arm above a wire connected to it (the gate moves the switch level arm) - so this stays open (or closed) and the game starts.
I do notice, the two power pop bumpers are still actually titling the game (after a few hits on them with the ball) - so somehow the tilt is still working, and somehow these pop's are making it tilt.
Possibly once I find/fix that issue, I may be able to release the switch level arm noted above - to see if that resolves that issue as well?
A working wood rail EM, nothing like 'em!IMG_9324 (resized).jpgIMG_9326 (resized).jpgIMG_9328 (resized).jpg