The way that cage goes together I think you are going to be battling to keep your humidity up. Plus its to big for a baby.
If you are getting a young one I would suggest getting a tub to raise it in until it is big enough for a large cage. Tubs are cheap, easy to clean, and easy to keep. A uth can be used and so can a heat lamp if necessary, just use a lamp stand and don't place the fixture on the tub. Place foil over the sticky side of the uth. This will allow you to remove and move it from tub to tub as your snake grows without damaging the uth by puling it off. Most use foil duct tape to attach the uth where they need it. I would say a tub with cypress mulch, a hide, and a nice pool would set you up well. Mine likes to burrow and the cypress mulch is great fun for that. Just make sure the water bowl sets on the tub floor so your snake will not burrow under it and flip it.
When its big enough I suggest a pvc cage. They hold humidity great. My BRB is in a 4ft by 2 ft pvc cage and it holds humidity well enough that I use newspaper substrate. I have two hides and a large soaking bowl and he is doing great. The room is heated to 78-80 and he has a hotspot of 85 which he hardly ever uses. I also have rhp in my cages but they did not heat the cage well enough so I turned them off and bought a oil heater for the room.
Also I case you have not seem the caresheet here it is. http://ball-pythons.net/forums/showt...ates-cenchria)