——The Corps of Engineers is still in the procurement process.....
Hmmm. One wonders if that is a stall point
$6 million a mile.
The Corps of Engineers will have to issue a thick document called a Request for Proposals (RFP). For a contract of this sized it will have to be a full and open competition and the Corps will have to evaluate all submitted proposals. The RFP will contain the specifications for the wall and all of federal procurement regulations that a bidder must follow. Many, if not all, affect the price that a bidder can still bid and make a small profit. OHSA, Labor Department, Civil Rights Law, Compliance documents, etc., etc., etc.
What this guy is doing is preparing an unsolicited proposal and he certainly can do that. But, unless he knows what he is doing, he will be firmly and politely told no. As for his price, the government must do a cost estimate on this work and any proposal that is wildly outside a reasonable range of the government cost estimate will be rejected. Doing business with the government is hard work, certainly on the paperwork side.