Looked at that site for you and in particular the product you mentioned. Seems rediculous. It's only 34" high on the outside. So what is the lamp height? At least 6" less than that? Then what is the base height of the net pots? At least 10"? So there is only 18" inbetween them and your gonna need to leave at least 1' so your plants can only grow to a height of 8"? 600 watt light that is not cooled in any way and that cab is closed, you will burn your plants nice and toasty.

Then what kind of bulb are they "giving" you? A MH? a HPS? is it a dual ballast?

Basically its a joke. If you want a very cheap system to just start that you can expand upon, start with a GH Waterfarm single bucket setup. That should cost you about $30. Plus a light kit with dual ballast and two lamps and you're on your way.

If you need more help let us know. I have a friend who owns a hydro shop and he can build you anything you'd like and ship it to you.