I do all of my own powder coating. I'm between big ovens right now, so I'm limited to only my small convection oven currently.
And from my experience, you'll make way more money if you offer it as a service. Lots of people have brackets, wheels, suspension components etc that they want coated. This takes the guess work out of wondering what parts would make you profit.
I'm sure you know how much powder coaters charge.( That's what made me learn how to do it myself. Other than being overly curious.)
Advertise it as a service, and the customers will come to you. I'd say weekly I get at least one person bringing in some random brake caliper, or hood props, door strikers, you name it really.
It's wicked fun isn't it?