I'm jealous your time machine appears to be nicer then mine to start minus the back glass. You have some boards to start something i had to find for mine. Good news from pics game appears to complete short of a apron. Don't see hacked up wires in head. I wish you luck on a good game thats not very common. One tip i will pass on check all clamping diodes everywhere this will yield some bad ones saving a board repair more then once something i learned the hard way on my checkpoint. Also found plug at transformer on de games seem to heat up also so it may need a re-pin which i did to turtles.
Don't skimp on power supply gut it or get a rebuild form someone good.
As for me i replaced everything but heat sinks>some may call it overkill but its over 30 years old and they don't just catch on fire for no reason.