I think you’re going to need to provide a CAD file with dimensions. After that, find a machining shop that can cut it for you. I think getting the Delrin will not be too difficult, at least maybe not for them. Having a machine shop with the right tools might be the problem. Make sure they understand what you are doing and can work with the material you want them to work with.
Just be warned, one-offs can be a bit expensive. The costs come down when you do larger quantities. I think everyone does that.
So, step 1 is CAD stuff. While you’re working on that, you can investigate machining shops. Leave the delrin part for the end, it will most likely be another problem to work out, but it won’t require interviews and inspections and site visits. But then again maybe the machine shop can get it for you.
I like my delrin Half & Half. I’m debating a C3 YoYoDesigns Halo or something like that because I like how the delrin feels in the hand, so soft and smooth. It’s kind of on the smaller side of things for me, but it’s similar to my dv888 and MMN as far as shape and size. Definitely a fun throw and material. I would say though, texture the grinding areas as everyone seems to want to grind.