You are doing a fantastic job mate.  
Your mpu, solenoid & power rectifier boards are all refurbished and ready to go.
The Acid damage on the MPU was a bit of a mission but I have sorted it for you.
And the 'custom' wiring on the rectifier board, lets say it was a  challenge to get it back to standard wiring .  

mate you do some fantastic work, so you are the guy to talk to if there is problems with boards, ive always had concerns that if they died how i would replace or if repair was possible, now i know the answer.
im loving this thread. not only is good to see people doing up their machines but gives inspiration and ideas on how to do it your self, esp when you a noob like me.
im liking the look of this space invaders machine. looks like a fun game