Just get started.
That is my point. Just build.
The solar wall ideas just look like a solar panel supply for Mexico.
I like the solar panel version. And I would like the high speed train as well. It could start in San Diego go through Tuscan, El Paso, and along the Rio Grand to Brownsville. And it could spur up to cities like Phoenix, San Antonia, and Houston.
Start with the panels so it could watch and detect everything. The train could come in several years. How could the greens hate it. It will be the largest panel field on earth. Maybe even throw a few windmills on the towers. Sell the electricity to Mexico so they can pay for the wall.