Reading over the flying cloud castle last chapter of Giantslayer reminded me about the flying pyramids in the last chapter of Mummy's Mask. And then a great idea popped into my head, a game with flying pyramids vs. cloud castles!
It might be fun to put the Giant Cloud Castle at the end of Mummy's Mask or the flying pyramids at the end of Giantslayer, or maybe just a whole new game with an assumption that these things exist. Heck you could even throw in some resurgent dwarven Sky Citadels should you want to.