When I envision a “wall” or a border fence, I envision a triple fence which you can easily build from Paso to San Diego.
I have a hard time believing they will wall off access to the river from the US side. Maybe there will be a single strand down the middle of the river? Is that what you mean?
It does not have to be on the boundary.
The present portion is offset substantially from the river itself. There are numerous sites showing what it looks like.
They might have to spike it as it looks like the 18 foot wall is still being scaled.
Owners have keys to opening to access the river side of the fence.