I own one and wonder why you would want to mod it, it is so beautiful.
Still if you do, cutting/piercing/drilling, etc. through a "soft", very light gauge metal like the panels on the Praetorian will require a good bit of skill if you want the end result to match the quality of the case to begin with. I'd look in the Yellow Pages or equiv. for a Tool & Die shop in your area. They would have a bunch of ways to do nice "clean" mods for you. An hour's worth of a Tool & Diemaker's time will probably cost you $50, but you could get a lot done in an hour, way way less time for simple fan cutouts/holes or something. A good T & D man could probably turn your case in to a Lian Li V1000 clone (ie. riddle it with tiny holes) in an hour if he had the right machine ... 😀