Hi Daniel,
Yea, the cages are 48" long, by 24" wide, by 16" high. We build them 16" high because by the time we mount the flourescent strip and susspend it some it's normally about 12" off the ground, then under the rock/branch they can get about 6" to it which makes it good for the UVB. 24" cage don't do much if anything for UVB unless you have a lot of branches/stuff getting close to the UVB. We prefer to keep the cages smaller height wise.
The ceramic fixture is wired to a regular 6' extension cord or so. I strip off the end that you plug something into and wire the wires to the socket. The socket is then attached to a metal "house box" that are used for electrical outlets and such. It's designed specifically for this and keeps the wire/contacts off the wood and safe.
You can buy them at Home Depot. I belive the porcelain socket was about $2 and the case was about the same as well.
We buy the plastic guides from DoItBest.com. Here is the link:
http://doitbest.com/shop/product.asp?mscssid=QE73MG9X70EC8P1WDHT6PAAS37LXDE57&mbrid=6790&dept_id=2102&sku=228658
They work well but are ugly lol. There are other links out there that are different colors but they are more expensive and we just use these because we buy so many. One day once we have a permenant reptile room i'll drop the cash to make it all nice, but right now with the moving and all everything gets banged up.
Hope that helps.
brandon
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Dragons by Nature