Your cost analysis is right on IF DONE BY PRIVATE ENTERPRISE but when you factor in the government the cost would be at least 4 times that but still cheaper than what the illeglas are costing us today.
I might add that the current border patrol personel should be re deployed to seek out, arrest, and fine the businesses and individuals that hire the illegals and deport the illegals purging the nation of the disease that is killing us.
Great idea. But the president would never allow such a policy to be put into effect.