I see no reason we only can have one company involved.
Split the border up in 100-mile sections. Have the top company work five of them. The next company four. The next three. The next two. That makes 1400 miles, accounted for.
Then split the rest up into 100 mile sections, and have the rest work on that wall as you see fit.
Put the top company on the most critical.
The second company on the next most critical.
That way you will rapidly get the entire border wall built, and you will reward the top bidders with the best contracts.
Just my opinion.
The military construction units could do the small segments, with active duty, reserve and Guard units all pitching in. They build bridges, roads, hospitals and schools in Central America all the time.
Very biblical. Almost like the parable of the talents.
I like it.
The remobilization costs will kill the cost benefit.