Here you can see the hold layout, legs, and back box. I used UnclueT's measurements and referred to the images here A LOT:
https://unclet.arcadecontrols.com/SkeeBall/SkeeballMain.htmlI used RJ45 connectors with couplers to quickly unhook everything for easy moving.
I used a ball routing design that I saw somewhere else, or at least something similar to point me in the right direction, but I don't remember where or who.
I tried using an official replacement solenoid mounted vertically for a ball release, and although it worked, it didn't work well with some of the games on the Major League Skee Ball software, so I ended up removing it.
I used 4" wall base without a lip for the rings.