This is a buttercream cake with edible image plaques, some with royal icing accents (like the windows)...some of the images I created, some I had. The bottom tier was the large square bottom of the topsy turvy pan set. I ended up carving it mad hatter style and then inward on the front. The webs are fondant extruded through a clay gun. All edible except the wires holding the word bubbles.Thanks for all of the wonderful ideas from other CCers! My son loved it.