Interest in group gathering info on how to get custom parts made?

Everyone--hey. I've been spending more time exploring how best to get custom parts made for my '06 Cayman S. Am currently working on a new set of aluminum interior door handles. Wanted to see who else is interested in learning more and sharing sources about how to get custom parts produced. A friend and I are exploring shifting more of our "real" time to this (starting w/my car and his bike). Would appreciate it if you could give me some brief input as we focus via this Google form: https://goo.gl/forms/43mwwj3MwBoEl8m63

Will then keep you updated. Thanks!

Gene