How much Arduino to replace most of that?
It makes me appreciate how much Atmel packed into ATmega MCU's for such low prices. The things are so self-contained they have an internal clock source.
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Part 2
Part 3.
I'm looking at state machines.
Nothing can beat an electro-mechanical pinball machine.
The feel and the sound, a MCU can never replicate that.
Tom.... 
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Sound, vibration and lights can be activated (need the Part 3 Knockers!), the ball and table need 24V activation. Audio could include relay noises and piezos might drive a subtle vibration though logic and outputs are chip and transistor.
This thread is more about how code could model physical machines.
He shows an interlock set when a ball is released, very real world, it fixed a problem old machines got. Don't count a task finished without a test.