I have the low end Eastwood gun. It's not bad for hobbiest type stuff. It's a good intro gun till you get serious and setup to the high end guns.
To bake the stuff I bought a used oven for like $20 and then spend about $80 putting in a 220 line in the garage to plug the oven into. You can also use a large toaster oven, did that for awhile, the problem with the toaster oven is I had to stand it on it's side in order to put a cup in there and when you do that the temp. sensors are not in the right place so controlling the temperature is not very accurate. I have also seen small 110 ovens that can be used for doing cups but that about all that would fit in one, and they were pretty pricey. Used oven and a 220 line in the garage was the cheapest option I found.
To start with I used a large cardboard box as my powder cabinet, but that got annoying real quick so I eventually built a cabinet, put a fan in it to pull the powder away from me as I sprayed, added a hook to hang parts from and built some metal stands to hold the cups. All in all it was a pretty fun project.
As for the design, I just use standard vinyl, put it on and spray the powder, then throw it in the oven for about 2 minutes, just long enough to get the powder to flow. Pull it out and carefully remove the vinyl then stick it back in and finish the baking process.