I've been reading up on the idea of powder coating at home on the net. Seems like it's pretty common and gives good results! Though, it doesn't seem very cost effective for just a few parts and every site mentions using an old second hand oven.
Seems to me you'd be mostly limited by the size of the oven you use, but it's a very interesting idea none the less! Found this supplier for us Aussies
Powder Coating System