I’m kind of wondering why you’re not using CeraCoat? I use to do a lot of coating with it years ago. Prep is the primary thing you must work out. I would bead blast the metal pieces. They use to sell a starter kit that includes three colors and and a hvlp gun. I bought a few cheap Walmart toaster ovens to bake things in. Schedule 40 plumbing connectors will hold up to the heat you need for baking which is about 300 if you need to hold things up. Picture hanging wire allow things like barrels to be hung for painting.