I've been futzing around with the idea of trying to create a large hill in a map wherein a good portion of the hill is in a 3-D skybox. But as it'd be a displacement, this raises certain issues. Like how to get the skybox portion and the non-skybox portion to match up. So here's my idea: you build the map at normal scale, including the portion of the displacement that will be in the skybox. Sew the in-box and out-of-box portions together. Then you copy, paste, and scale down the whole thing- sans props- and then delete the in-map elements as usual. Leaving you with the portion of the hill that's outside, scaled appropriately and set up so that it meets the edges of the actual map. Would that work? Or would the process of scaling and so on cause inherent difficulties with the whole thing?