My GVR4 is one of the cars that has the ASC installed sunroof, not the Mitsu sunroof. I've done headliners before, but this car is very different. I removed the old headliner, and discoved that there is no backer board like most have. Instead, there are just a couple sections of the original Mistu headliner and board. There is a strip near the front window, a strip near the rear window, and small pieces near the dome and map lights. The ASC headliner was glued to those, and streched/suspened over all of the gaps, with nothing in contact with the back of the headliner. Has anyone replaced one of these? Is it as hard as it looks?