Maybe it would be easier to just move the dirt where you wanted it but the idea that an entire skeleton is below your feet, at all times, would be pretty cool. I'm all for minimalism, btw but in the collective variation of course design, seems there would be room for one of these.
Dirt is very heavy, so I can't see how a "skeleton" would stave off collapse. If it was strong enough I'd guess it would cost much more than just moving enough earth [or bringing in enough fill] to get the shapes you want.
No idea what the cost would be of layering some sort of hard plastic into structures that not even dirt would collapse....but I guess it does't really matter how you get there.The course would be called, "The Roller Coaster." Premium would be placed on the bounding ball, left to right, right to left, banked speed slots and being left out if you missed them.
Just to get the traditionalists really angry, there would be one hole with two greens, a 90 degree dog leg with the landing area being a plateau. The first green would sit in the middle of the plateau, be a punch bowl and have a garbage can sized mouth in the center. You would aim for it off the tee. If you execute the shot and the ball goes in the big hole, it would be piped down, under the ground and release on the second green for an eagle attempt. Players missing would have the choice of trying to pitch into it or just play for the green, traditionally.
You would need a lot of height on such a course, so perhaps you have elevators that take the carts up to platform tee boxes so you could see much of the bounding. The course would be pretty easy...many of the bad shots would be "saved" by banks and such.
Would actually be quite funny and an ironic if you, Mr. D, were to build a totally zany, manufactured, fun, course..."The minimalist goes off the rails...." I see it in Vegas, under lights...