Surely noone leaves the side rails on? Take em off and the true base colour is underneath, plus look at the real colours that were hiding behind the door trim!! Pinballs were VERY vibrant when new..
Some do, some don't !
Many yrs ago I used to leave them on, out of fear of destroying them.. that and i didnt know where to get the twist nails to replace the old ones, and as a result i got real good as a siderail masker upperer
but now, having gotten pretty good at removing them I always remove them on any cab i'm repainting
EDIT; looking forward to seeing how this one turns out, will be great to see the before and after pics