i built a cage a few months ago, it was 4x2x2. that might be a little to big compared to whet you might want but ill tell you how i did it. for vents a used the vents that you use for the A/C and heating. use a jigsaw to cut the appropriate size for the vent in the wood(which i used to build the cage) and then use a small screw to screw the vent into the wood. for mine since it was huge i used to vents. for the floor of the cage use marine plywood or that plywood with the white covering(i forget what its called) for heat just get a normal light ficture from a hardwood store and crew it into the top of the cage. use a electrical wire that runs from the fixture to the back of the cage and into the electrical socket. mine has a thermostat and a cover for the flourescent bulb in there with power switches but i cant tell you how to do all that my dad helped me with that.