There's a guy who made a couple of the brackets for Attack From Mars on a printer. I think the printers are capable of making some of the non-aesthetic parts. For example you wouldn't print a clear plastic ramp yet, but you might print a subway ramp.

How important is it to keep everything on a game original? There are many parts that were made of metal but an ABS part might work as well, or better.

It also might be possible to print something like the mountains on Wipe Out, and then use a resin or epoxy surface finish to give them gloss. It would be expensive, but much cheaper than fabricating them from scratch.