can't wait to see you put a wood screw through the roof...
Replace your back window at the same time. It'll make getting the headliner in and out easier. If you can, remove the interior and do all the work to the headliner inside the car since getting it in and out without damaging it requires a lot (factory says remove all front seats and console, as well as front passenger door.) Junkyard says removing the rear window is the easiest (park under a tree. When ready to re-install, pop the rear window, reinstall headliner. put branch in rear window. call insurance for glass coverage)
2007 Saturn Aura XR | 1970 Chevy Blazer 4x4 | 1970 GMC 3/4 Suburban 4x4