There are seven optos in the left subway. One under each scoop and four lined up by the servo lifter. There are three optos in the right subway. One under the drop from the middle playfield, one from the scoop, and one right on top of the servo lifter. Staging on that left side will be easy. Staging on the right side is a bit more complicated. If the game ever misses a ball entering the scoop, there is no backup to tell the game that there are two balls at the lifter.
I wasn't actually checking on the optos about staging. I was investigating if it was an intentional choice to start and end the quick battles when the ball falls off of the middle playfield. My preference would be to only start or end the modes with a direct shot to the Beta Capsule. Seeing that there are independent optos for each entrance to the subway, I hope that is something that will be added as an option in the menu. Right now I'm guessing half of my modes start and end with an accidental drains from the middle playfield.
Quoted from happyclan:Oh man, look at that mess under the upper playfields. I pray I never need to work on anything in there.
They could add a few more cable tiedowns, but other then that I don't think you would have a problem. It's just different having all the connections under the playfield versus split between there and the backbox.