I have received a few inquiries as to my large cage. It is no closet, but it is a small house in some countries :P
The 2x4's at the corners are 4' tall and serve as a very convenient coat rack, but are intended to be tie points as well as positive locks for when I complete and finish out the cage system (3' more vertically - my animals are pets that I have chosen to showcase in my living room). The interior space is 2.5' tall with an exterior foot print of 4'x8'.
A few shots of the door slide construction (all threaded hardware is national course):
3/16" X 2" Aluminum flat bar
1/4" X LONG Flathead Screws
1/4" Flanged Wood Nuts
1/4" SAE cut washers
1/4" X 3/4" long rod couplings
1/4" Stainless Steel Finishing Washers
1/4" Acrylic Sheet
You do not need to use multiple pieces of aluminum on the sides and top, their only purpose is to offer enough support to not let 'em out.
The mating surfaces of the framing to the interior of the cage got a shot of caulking or liquid nails of some variety.
The all important access to power for heat. Everything I used was rated for 20 amps / 125 Volts. Before I complete everything for what I have in mind, there will be two 20 amp circuits installed behind the cages.
Before you say I have gone crazy with lights, I do cycle the lights and the entire hot end of the cage is evenly heated. I run 2 75watt black lights continuously and 2 60watt lights for a day time cycle (this is over 2 amps during the day). That is also what the red 'thing' is over the switch prior, lock out device for light switch. The reason that there are six holes total is because I did not know what I would have to have and for flexibility. To protect my babies from the heat of the lights and their escape, I used:
1/4" rabbit wire
5/16" Carriage Bolts (it is what I had)
3/8" plywood
Caulking to glue the peg board to the wire and plywood backer
Top side
Inside
The water source that I chose was a single bay kitchen sink. You can get the faucet hole caps at any harware store, as well as everything else that you will need. 1 1/4" pipe works very well for me and yes it is a pain in the but to clean, but I still enjoy it.
I chose to use plywood and laminate it with pvc sheeting, copious amounts of silicone sealant and wood frame construction because what I want will be lighter that way. If you were to use melamine it would be heavier, but you would also have fewer steps and less toxic fumes to deal with (the frp and pvc glue is ROUGH). I chose to use pegboard for the ceiling for additional ventilation.
Feel free to ask any questions.