The switches must change state over the course of a complete revolution of the score motor. I can't speak to this game but when the actuator drops into the groove of the score wheel the switches must change state. There is no point to a switch that doesn't switch. The circuit diagram should show the switches in a certain state at a moment in time. This should help to work out their configuration.
I imagine plumbing and electrical would run on the exterior or interior surface of the walls. Just like a prefab concrete structure does not have pipes in the walls. There is also the floor that may contain pipes.
Good question. I started working in 1981 as an apprentice plumber with my Father. I started going to the local shopping centre after work and discovered pinball and arcades. I could play them and also hang out without it being weird. It was like a social lubricant. I could fit in so to speak without having to socialise. I met some nice people and had some fun times and I still have this nostalgia today.
I have often looked at all the sharp pokey bits under the playfield and thought how much it would hurt if that fell on me. I imagine the wife or kids finding me stuck under the playfield having bled out. Nasty business.
Not entirely sure what is happening here but I enjoy seeing what you are doing and look forward to the outcome. Thanks for always keeping us up to date on what you are up to.
I have one of these. Mine has no backglass. I got mine for free with the purchase of a kiddie ride. The cabinet had to be remade with ply as they are made from compressed chip wood which falls apart. Mine boots fully but I am chasing display issues amongst other things. I have had fun mucking around with it. Not much info on the internet but i have a manual and schematic.