You can get repro plastics from the states, but that works out at around £200, so watch that one.
Ramps absolutely not, they are like hens teeth, very rare.
Mine is missing the original lock bar and two of the stand up targets don't match, didn't spot this when I bought her, but you can't get those either.
Rare machines can also mean rare parts. My Time Machine was my first pin, I paid more that I should have, but the back glass, the chimes, the soundtrack and the speed means I don't mind. Anyone comes round and they pick that over other machines because it's fun and easy to understand.
Don't over pay, and be prepared to walk away if it's not as you expected.