I should say from the beginning that I am not a stickler for except cabinet paint; my pins are (or will eventually be) all lined up so that (for most) the sides are not very visible (especially the backbox sides, which only have about an inch or two of clearance with the adjacent ones), and in any case, I like a dark gameroom.
This is Williams Apollo, and looking back, I probably should have declined purchasing it with this cabinet paint situation (i.e., the bottom cabinet being completely painted white, except for a little section in a corner near the front), but it's what I have, so I'll have to deal with it. The other side (including that side's backbox side) is in very good stock condition, and the original side's backbox side is decent condition except for where some punk had scratched a big X.
I figure I have the following options:
 Complete repaint (using spray paint) using stencils, with the entire process of removing the metal side rails, etc.
 Simply repaint (using brushed paint) the bad side (including touching up the X) using a whitish paint that matches the current faded white on the other side, and simply use transparency sheets to get the layout of the good side, and getting it "close" on the other (any yes, with the proper enantiomorphic transposition).
 #2 but with bright white paint, and repainting one half of the front of the cabinet (I was considering putting in a black stripe right down the middle to aid in the transition.
I am pretty much don't care to do #1 as it is a lot of work for something that it not that valuable to me, and also I'd hate to destroy such a nice stock paint job. #2 or #3 would require a very good matching paint, both the faded white (for #2) and the other colors (reddish-orange & deep blue). I have some latex paint in both an off-white (Color Place Antique White) and a pure white, so I could probably mix them together to get a pretty good match. The other colors could be a bit of a problem to match well, although I guess I could get a starting color that it close and mix in other colors to get it right.
Something I am concerned about is if I match the faded white of the original side, it will eventually fade into something that doesn't match the faded original side, so it's like I'd have to paint it with an off-white that is not quite as off and simply let it fade into its proper color (somewhat like getting jeans pants legs taken up - a necessity with me being short - leaving an extra half-inch that will eventually be shortened by the normal shrinkage).
Of course, it would be nice to get the original orange & blue paint, so that would not be an issue.