Looking around a bit, the rims at:
https://www.instagram.com/p/CyMcn48rUKD/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==
are of course quite easily drawn up and cut as shown at:
If you’ll provide a drawing of a more complex part we can walk through making it in a couple of ways with you and you can determine what approach best suits how you wish to approach things.