This is the 5th topic you've created recently, stick to 1 topic and it will be easier for us to help track your issues and progress.

Have you tried reseating the switch connectors on the MPU?

Have you tried doing a factory reset like I recommended in one of your previous threads?

No worries, I agree you are really close here to a working game.

When you try to start a game, you get absolutely no response when pressing the start button? Not even an error that all balls can't be found? If it was an issue with one of the trough switches it should make some noise and complain about not finding the balls. There could be a short in the wiring somewhere. The plumb bob tilt, roll tilt, and slam tilt switches all have CJ3-14 in common, with slam tilt returning on CJ3-5 and plumb bob+roll tilts returning on CJ3-4. Check for any obvious issues with these wires or trough switch wiring.

If it's the same as Strange Science they just use coin door switches in the trough. I used this one and it worked http://www.marcospecialties.com/pinball-parts/12-CCS312 (OOS currently)

This should work, you'll just need to swap over your existing actuator wire: https://www.pinballlife.com/index.php?p=product&id=4367

You will need to add the diode

Looks like I have a follower, this gmkalos guy likes to search for my posts and downvote them regardless of their content. Hi gmkalos!

Could be bad transistors that have shorted on, test transistors Q15 and Q39. These can be replaced with more the robust and readily available TIP102 if needed.