The first picture is Mike (from Premier Car Wash Systems) and Williams marking off before setting the rails. The second picture shows the transit level that I rented from Alabama Rental for around $25 and the third picture shows my awesome laser level Mike used to level off the first rail.
Then, after all the setup, there was a lot of drilling (first picture) and a lot of measuring with a large stick (second picture). Then we were done (third picture) which took around 2 1/2 to 3 hours.