I don't see the problem. The most expensive and time consuming of the operation would be the foundation. The concrete panels would be precast and brought on-sight by trucks and placed by cranes. It would proceed much faster than most imagine.
I was recently involved with a project that involved precast. It went like lightening.
The foundations could be drilled piers every 10 feet (the panels themselves are strong enough to span from pier to pier)...really limiting the amount of concrete hauled to the site. They could even pre-cast the piers and place them in a slightly over-sized hole, and use a minimal amount of concrete around that, to further reduce on site concrete.
And, as you suggest, the bulk of the labor would occur at batching plants, where the panels could be cast. No need for labor camps in the desert. Just one crew could make good production...I’d estimate up to 10 miles per year for one crew.