i took a old rotissere (spelling?) busted it apart and kept the 2 sides added sheet metal to make a booth, the rotissere spins perfect for finish and has a 4hr timer.
then i used a harbour freight dust collector and piped it out a window into the yard. it would be ideal to box it in like a closet but i run fan behind me and blow everything into the collector, its primitive but it works.
good luck.
if you have the funds it would be great if you bought a cheap metal shed and made a spray room seprate from the shop.