Your labor will give you hours of enjoyment. Finished mine about a year ago. Little different design. Stacked RR ties in a v shape about 7‘ high. Built a bullet catcher/target holder as I did not want to put lead into the environment. Mine is only 105’ long but adequate for my needs. Sets behind a 12x30 shed that I walled off the last 5 feet and screened in the half walls, so I can soot udercover on cement and easily capture most of the brass (and steel) plus keep the supplies on the shelf. Most important I bought a sign with the gun safety rules that is hung above the shelf to let guest know it’s fun but not games.