A group of immigration hardliners who used millions of crowdfunded dollars to build a border barrier on private land along the U.S.-Mexico border unveiled the nearly completed half-mile steel bollard fence Thursday following construction delays.

The 2,300-feet-long project marks the first time a nongovernment organization or individual has built a wall on privately owned land on the international boundary. It runs up a rocky 320-feet-tall hill and is 18 to 20 feet tall, depending on the point on the hill where it is measured.

Former White House chief strategist Steve Bannon, former Kansas State Secretary Kris Kobach, World Series MLB player Curt Schilling, Blackwater USA founder Erik Prince, and other longtime supporters of President Trump were on site at the project in Sunland Park, N.M., to showcase the fence, which stands on less than half a mile of the 1,954-mile border.

The undertaking has evolved, prompting questions about how money is being spent and the Trump administration’s involvement in the process.