Those playfields look amazing, nice work on restoring them 
With the 2 colour variations,
 I prefer the one on the right with the light brown tones on the sides of playfield , and the Insert lettering looks a lot clearer .
 How many are you rebuilding?
Oh and i agree some of the Bally mechs are a little bit crappy , el cheapo , The Gottlieb stuff almost never breaks, i suppose thats why they got reused all the time..
keep up the great work ..