Tom,
Some sound observations! On the Trumpbungle Dunes project, I've seen very little existing sward at all on the pictures I've seen of that land. It seems to be, in the main, a combination of: vast dunesland, washed-out, water collecting basins, wild, scrubby mounding and Sahara-like expanses of sand. The shots pictured of yesteryear all seem to have significant turf areas to contest the gauwf. Given those times, is there much record of extensive turfing of areas without much sward, or as you say, did they just look for more suitable sites to start with?
I've heard mention of rather elevated tee locations on some of theTrump's design changes. From your experience, given the stiff winds that area is subject to frequently, it would seem flighting and controlling the ball off such areas, especially at the back 8,000yd tees the Donald will no doubt have, would be problematic, no? Also, how realistic is it to expecting significant, driving, shifting sand, not to impact the maintaining and playing integrity of areas in proximity to massive exposed dune areas near teeing and green sites?