Google TORKS' Tom Jones Field in OKC.

The runway shown is asphalt that has been there since the 1970's. it measures 32 by 350. We had some patching done a decade ago and found out that the THICKEST point was a whole 1-1/2 inches. most of it was just 3/4 thick. It was laid on hard packed soil and we've had 5 1:1 scale helicopters on it at one time.

One thing to consider in your width decision is how wide of a path does the paving machine do? I doubt very much that they drop half widths. Ours is 32 feet wide because that was one pass by the paving machine

HTH

Good luck with the project