This proposed design for Trump's border wall will not be built. Neither will any of the other walls proposed. A few sections of wall will be erected in convenient locations to serve as a backdrop for a press conference or two, but then they will fall into disrepair--which will be documented by another news conference or two.
We can be certain that any walls erected will involve the labor of undocumented workers at some point in the supply chain. Hopefully, they'll be paid well.