I would jump all over that boat at that price, but thats me, and I have always been a fan of that hull. Assuming the tower is oem from 2005 I think they are very sharp looking boats.
Having switches but no bags is not unheard of. the dash is essentially the same for all boats i.e. x2, 205v or that era share the same dash more or less. Since it could have been an option for internal ballast, its very well a possibility that the switches are there, the breakers are there, and you would have to do pumps, bags, hoses, and fittings (yes, drilling holes), but electrically you are good to go. Not apples to apples, but my pretty bare Malibu Iride has about 5 switches labeled Acc, for if and when I ever decide to wire up a plumbed ballast bag or a heater or shower.