TomD:
I know what you mean about some of those Mackenzie knooks and crannies in some bunker areas. Obviously Maxwell did it too (I'm sure he got the style from his collaboration with Mackenzie). We've long had one area in a front bunker on our #8 Maxwell green-end at GMGC which was so narrow you really couldn't get in there and swing toward the green. That cape did vegetate out and grow significantly wider though over the decades signifcantly narrowing the long sand bay. We looked carefully at the aerial just after it was built, scaled and measured it and Gil restored it to it's original width so it's a little easier to swing out of now.
The incredible multipicity of shapes, sizes and every other bunker dimension does fascinate one about Crump and PVGC for sure but obviously many of those bunkers have vegetated out and narrowed things. I was just there today with your head honcho looking the place over from every angle, particularly the greens and some of those quirky little bunker areas. Behind #13 (where few likely go) there's a really narrow what I call "river" bunker that runs around most of the back of the green. If you got anywhere in that it looks like you could only swing sideways---although your stance would have to be outside the bunker and you'd probably have to be nearly on your knees. Only problem is if you had to swing side ways from back there it looks like there's no reasonable place at all to go--except into even more trouble. That's why PVGC can be so unique.
There was a very famous bunker area like that to the left of #10. All golfers who knew that course well in tournaments I know knew to avoid that area at all costs, and it sure always got in my head on the tee. Sometimes I just hit less club to the green to be sure to avoid that area altogether. Many a really good player could get stuck in there for a while because basically you couldn't come out at the green and were always in real danger of having the ball hit you in there. The smartest play, perhaps the only play, from that area was to just putt the ball down to the front of the bunker at the front of the green.
They've changed that area now, cut back the lips and smoothed that sand area out and you can play out of there now. And then, of course catty corner to that bunker area was the DA. In all my tournament years there I thankfully never got in the DA, but if I had I think I would've just gone back to the tee and played stroke and distance.