Just throwing out a line to the community here that a family member of mine does powdercoating in the Kieler area (obviously you can ship stuff too). His oven is 6' high by 6' wide by 10' deep, so he can accommodate most parts and has been doing it for about 5 years.
IK he works a lot through facebook so i'll throw up that page link since it has all the appropriate contact information/ pics of his work..
https://www.facebook.com/pages/halfbaked-powder-coating/229698953517
Just doing him a solid, and throwing another option out there for larger parts/ wheels for everyone.