GIANT Iguana Enclosure

[Bighead]

I may buy a house in a year or two that has a small barn on the property. I was thinking about turning half of it into a big iguana habitat because of all of the ones I see up for adoption and in poor homes. My main concern is, is it safe to keep large groups together if the enlosure has enough space or does it need to be one male to a group of females, etc. Also, what are some ways I could cut down on costs for feeding that many large animals? I have plenty of time to prepare and educate myself, but was wondering if I need to not dream about it to begin with. Thanks.