I buy some Eastwood specialty powders but for basic blacks (in various gloss %), I but bulk through ebay 5lbs at a time. Eastwood's black wrinkle comes out really nice, not too grainy and EASY. Haven't tried clear coating but I've had some on my shelf for years.
My powder gun is the original Eastwood home gun from when they first started making them. I heard the HF gun is more than adequate and inexpensive.
As far as the diswasher box, it's a perfect size for most items, the inside of a dishwasher (plastic or s.s.) would be OK too but too small for a lot of items.
I built a small lazy-susan for painting small items as well as a hanging hook on a swivel.
I'd really like a nice big oven. I read somewhere online where a guy extended his oven with aluminum faced ductwork insulation. Probably OK for 20 minutes at a time without burning the joint down.