My setup is geared more towards cloning and vegging so being light proof is not an issue but beyond that, I think the suggestions you've gotten are good ones. That light is going to be quite warm so separating with a piece of glass is a good idea. You will want some exhaust fans - I use two in mine: 110 cfm in the bottom which is on 18/6 when the T5 lamps are on and a 85cfm in the top which runs all the time, 24/7. The temps in my cabinet are within 3 or 4 degrees of the outside room with the lights on.

Intake can be passive and work fine. If you are going to flower in there, you will need to light proof it as well. Like Dusto2K3 said, there are many threads on here that successfully use HID lamps in cabs like this so you have all the info you need right at your fingertips.

Frankly if it were me doing it, I would use a cooltube ($60) and a 4" vortex fan ($100) and that would be the end of most heat problems (except radiant heat which fans don't help)

I think these are like $100 to $180 Dusto2K3 - I got mine from someone getting rid of theirs so I didn't have to pay for it.

Good Luck and happy growing!!