looking good so far Beaky
I just replaced one of these MPU boards In a client's Bride of Pinbot that i thought would be too far gone. I replaced it with a Rotten Dog MPU bought from Mad Amusements in the states, which is doing the job nicely.
After looking at these boards you're working on i might have to see if i can do the same with the old one.. glad i didn't chuck it out now
Looking forward to further updates!!