is it acrylic or glass? do you want to do a gravity fed fuge or put it under the tank, and how big is your display going to be? I am assuming the 90 gallon reef? you could definately use it, not sure how much impact it would make.
If your doing gravity fed and don't allready have a sump, you will need to get an overflow or have Dan build you one. either way you will probably want to drill it, easy if it's acrylic, hard if it's glass. if your doing gravity fed you can use a powerhead in the display tank to push water up into it, and have it drain back, if your going from below you will probably need to put baffles in it if you don't have a sump.
As far as setting it up for pod production, a coarse substrate, live rock rubble and macro algae are ideal. You can also follow blakes lead and use a chichlid cave, they are little pottery igloo looking guys, and pods will congregate inside them. I have also heard of people using filter floss and sponges, but I think Live rock rubble would be better, if memory serves Aquatic warehouse almost always has a tank full of rubble for sale at a good price.
water movement should not be high, a low turn over rate is good in a fuge. Gravity fed is better for getting more pods back in the tank, but in many instances, a gravity fed refugium is simply inconvienient... can you imagine the trouble in removing your canopy to work on the tank? eek... that is the only reason I haven't done one, but if you have a space NEXT to the tank where you can do a gravity feed, I would say go for it.
to get your pods started, simply hit up one of us that already has a population going...
"Maybe in order to understand mankind, we have to look at the word itself: "Mankind". Basically, it's made up of two separate words - "mank" and "ind". What do these words mean ? It's a mystery, and that's why so is mankind." ~ Jack Handey