My pinbot has some wear near the top left out hole also.
it's not as bad as yours but it sticks out like dogs balls. if it didn't i would have scanned it for you.
i will be giving my pinbot an overhall eventually so i will be watching this thread with interest.
keep up the great work 
There some good scans on IPDB.org - and I have commissioned a resident artist to assist
I might try airbrushing the two outholes.
