Maybe this isn't the best place to ask, but I wondered - since you offer support for Drunk World seeds (and Fargo's BoBW mod), have you considered the possibility of an option for layering both the Depths and Underworld in the same world? That is, once the player reaches the end of the Caverns layer, they would reach the Depths, and then beneath that is the Underworld (or vice-versa, whichever works better)?