Well, we know where your mind is…
But back to the original intent of the thread.
Hex is pretty good at making small things, even some pretty big ones (buildings and vehicles), but for organic or large scale items, it falls flat. It’s really a drawback of all modelling apps. They have a range of things they can do well and things that are borderline or outside of that range; those are hard to impossible to do convincingly in that program. There isn’t one app that does it all.
And for things like terrain, it is a lot easier (both on ones sanity and getting convincing results) to use a specialized app made for that kind of modeling. Bryce/Vue can both handle it with ease. Terragen can, too, but probably isn’t as easy to use, out of that group (it’s kind of the Blender of terrain apps…very powerful but not all that easy to use).
I bet it would be easier to do in Zbrush (or even Sculptris) than it would be in Hex.