i too am about to buid a outside cage and looked into these. fist are your iguanas full grown adults? i think they would have to be to make sure they cant get threw holes in fencing... if they can get a head threw a body can follow. if that appers safe go for it if not u may want to consider pvc coated hardware cloth for sides as well also i dont trust that top i may think about putting hardware cloth on that as well if my rhinos were staying in that pen overnight id cloth the whole thing with mayby even 2 layers u want it to be escape proff as well as keeping rats raccons and possums out. a locking door my also be a consideration.the rock idea substrate sounds good i like sand because it drains very well and to clean it i just use a lage tropical fish net and shift threw it twice a week picks out all old food droppings and poop in about 5 mins.also u may think about puttig a layer of wood around the bottom about 2 ft high to keep iguans from running into wire and smashing nose bloddy, if your lizards are not used to being out in sun for a long time they flip out a little bit for a while every time u go near cage. im not trying to insult your idea i too looked into this but decided to build it semmed like in the long run it would cost more money and be less secure. im going to start my new outside cage in about a week or so ill post pics and updates on how much i spend looks like right now for a 8ft x 10ft x 6ft cage will cost me about $200 to 250. and that includes a 2ft x 3ft heated house. im nerby in nj so materils would be the same. thanks... see if u could retun it before u open it???

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