Your talking 3' width correct? not height.
I have Sicle the corn in a 36wx18hx18d front opening Exo-Terra right now, found some pvc 1" pipe and fittings in the garage and am trying to build a jungle gym
type playground that's fits in there with his hides ect. Figured he would like that, along with a hanging small basket you told me about earlier for him to hang out in.
Just figured the bigger the cage the better for his length.
I also have the hand built cage I got last summer when I got Cheyenne, It's in the garage trying to find the time
to make room for it in the house, and get it cleaned up and bought in so he has another play area when I have him out.