Thanks, I think I can do something about the ball.
But Unity really needs to improve it's physics to make this more realistic. Things go really weird at high velocities. We need more effective collision detection and several other things.
While I had my share of fun while designing this board, you can see it's design is amateur at its best. Designing pin ball table is highly addictive and can take months to come up. Anyway, I've tried to include most of the systems (mechanisms) here so that the kit buyers can immediately start off. And hopefully I'll include the remaining features in a future update, in a new table.
Also, as I'm upgrading the kits with mobile controllers, I plan to release this with those controller systems from the start.