Your back glass is actually in great shape compared to most.

You can flatten warped playfield plastics with a heat gun and two sheets of glass with a weight on it. Works well. If you have missing plastics you are in luck;
https://www.marcospecialties.com/pinball-parts/30C-397

Posts and everything else is readily available for purchase if needed.

As stated, typical condition of many old EM's.

What’s wrong with the rollovers? Are they broken? If you had to change them I wouldn’t worry about using different color, doesn’t effect gameplay.

Id love to get my hands on one. And yours has a great back glass, they typically didn’t age well.