well to get the correct angle the tank was cut in half and traced onto the floor and then a hydraulic tube bender was used with some blocks in it to try to keep the kinking in the rectangle tube to a minimum and then we just kept bending and matching it up to the mark on the floor till it matched perfect. each spot the bender was moved to was measured and recorded so when the 2nd rail was bent the bender was put in the exact same spots.. they are pretty much both dead on. the fun part is gonna be getting the crossmembers all squared and welded in.