If you have a decent pattern, you can make a headliner out of Formica and bend it to fit using a handheld hair dryer. It will not shrink nor warp and if lightly sanded can be painted. Most of the cardboard used today is not the same as what was available up into the early 80s. Most of the stuff I've seen is really on the flimsy side. Some use ABS plastic, but recently I saw some that was installed apx 6 years ago and (a) it had shrunk and (b) it was warped just like the cheap cardboard. So, I couldn't suggest that.
