take off the foot rail/lockdown bar and look at the bottom end of the metal rails.
a lot of times if metal rails were added the original wood rails were planed down to a more rectangular shape, so a wood rail conversion will require replacement rails.
for your backglass, the usual approach is to clean the clear areas and coat the entire back side in krylon triple-thick clear urethane. If the ink is flaking, you can push most of it down into the wet urethane or use saran wrap. Google for "pinball backglass krylon", there's lots of web sites and youtube vids.
depending on where the flaking is, it may not be worth trying to do anything besides coating with the krylon to stop more flaking. Damage in the translucent areas of the class is difficult to repair as you need to get the color AND opacity correct - e.g. the green 4/16/75 score area would take some effort with trial and error. Areas that have no light shining through are easier as you just need to get the color close enough then paint black over it.
I'd be surprised if you could get the color combo you'd want in zolatone without a custom mix that isn't available in small quantities.
how far you go in trying to reproduce the original finish is up to you, but most people just sand the old paint off after making stencils and paint with colors from rattle cans and forget about the text/splatter effect that zolatone provided. One option to explore is using a texture paint/primer/roller to get the bumpy surface then paint the other colors on top.
the original colors are different from what you see now due to oxidation and a few hundred layers of nicotine. If you take off the metal rails, the color underneath will be the original, but not all colors used on the cabinet will be under there.
making a machine look nice is whack-a-mole. Repaint the cabinet and the wood rails will look shoddy, refinish those and the foot rail metal plates and buttons will stand out, replace those and you'll be inclined the pay Coos a few $hundred for a near-perfect reproduction mirrored backglass, replace that and you'll notice the crazing in the playfield ink and start wondering how to get a reproduction playfield ... then someone will offer you $150 for the finished game