you will have fun with it and great for proofing a idea / design.
since the original part was possibly pot metal (die cast zinc) it doesn't have a great tensile strength so depending on the density of a plastic print it might do but you can always take your design (proof of concept) and upload to Shapeways and print in stainless steel though there are some size limits.
https://www.shapeways.com/marketplace?q=pinball&sort=newest
out of interest how big the actual part.