Seamless transitions? No. If you have stages and want to stack them sure. The only issue would be with the 3D skybox casting shadows on the map below it or being visible from below. You might be able to work around it utilizing the max render distance cutoff and putting them far enough apart vertically that they can't be rendered. That should also provide enough distance to prevent shadowing assuming your sun isn't near the zenith.
I think Dr.spud made something like that for haarp, ask him maybe.