That's cool..
Then you know that you can't just take any oven and use to cure powder coat. Yes it might work, but it's not feasible to do so. There is allot of risk when handling and curing powder coat. The dangerous mixture of Air, Dust, and a spark of Ignition (ADI) can cause a dust explosion... You can recommend buying a $35 oven to convert to curing powder coat. I wont! Why? I don't want to be blamed for giving the wrong advise that would cost someone there life or even big penalties and fines ($25,000.00 or more even jail time). It might not happen to you but what if your neighbor calls them because there is a strange odor coming from your residents. Don't take my word for it check out your local State Occupational Safety and Health Plans office to learn more about the powder coating laws.
http://www.osha.gov/fso/osp/index.html