Ugh, wanted to cry stressing about this one. The bride wanted the entire cake edible so I couldn't make the towers out of anything but cake. The notched out part on each turret is made of rice crispy treat and dipped in the cookie crumbs. I iced the whole thing in b/c and crumbed in Nilla Wafers. I transported it mostly assembled but put the details on there. The topper was provided by the bride and is blown glass seahorses. The top cake is a sandcastle bundt cake dipped in crumbs (no icing).