Can't find a pic of one that is set-up but the moment i have a pic i'll post it up. i think evil had a similar metal halide set-up but i can't be 100% sure on that.
but a hood similar to this 1 will work with a lil modification to the bulb holder.
Putting the ballast in under the hood isn't a good idea but you get a general idea on how the hood would look like.
BUT you must not forget to add a cooling fan or something, as you will see the temp in the tank go up using this type of lighting.
Edit: If you want to go T5 HO you can still use GLO products in this hood. Just get the right sized kit for your tank. The kit includes ballast, tube holders, and waterproof endcaps, which you screw into the hood and they are cheaper then the actual whole fitting you get.