I drew up some 4-up acrylic T cages in CAD for all to enjoy. They can be made stackable with the addition of some small feet on the bottom that fit inside the top portion of the lower cage. I left space on top to put in LED lighting if you want to. I will be building mine soon.
MaloDave
http://home.comcast.net/~n323xl/Arboreal-T-Cage.PDF
http://home.comcast.net/~n323xl/Terrestrial-T-Cage.PDF
MaloDave
http://home.comcast.net/~n323xl/Arboreal-T-Cage.PDF
http://home.comcast.net/~n323xl/Terrestrial-T-Cage.PDF