How big does a pigeon loft have to be to house six birds (three pairs) and what should the layout be?

I'm getting to the point of putting up hardware cloth and placing perches and such in my new loft. I have a question though. I have a 2'x4'x6'5" aviary that's open the the loft. Would there be any issue with me placing an automatic waterer in the aviary and the feed box in the loft? Does the...