First, when I got 99 hunter, it displayed the construction icon, don't know if it only applied to me this one time or if it happens to everyone.
http://prntscr.com/6baswmSecondly, the castle wars shop.
I don't know what's supposed to be, but if you click an item in your inventory which is sold in the shop it tells you how much the shop would buy it back for, but once you try to sell it you'll get a message saying 'You cannot sell any items to this shop'. I've only tested it with the items I had at hand, which was Ava's accumulator, Helm of Neitiznot and (unused) Brawling gloves (prayer).
http://prntscr.com/6bau70