I’m right there with you!
I have some construction experience in concrete and I have built fences since I was big enough to swing a hammer.
You could probably scare up all the personnel needed, from engineers to laborers right here on FR.
Had excavating type logging machinery, had excavating machinery which I dug footings here in AZ till the bust.
Ran them all. JD, Cat, Fiat Allis, you name it.
Gimme a 992 and stand clear. All the spoils can go to build a berm on the American side with a channel between the berm and wall. Level the top of the berm off for a road for patrols.
Lets go..git er done.