That's why they sell them for $24.95! Thin cardboard that bends very easily so you can close off the space. Two pieces so that one person can accomplish the installation without too much difficulty. Slide the front in under the front windshield rubber, the sides in under the door windlace, slide the floating strip over the back of the front piece, slip in the rear half and screw in the metal strip to hold it all in place. You've got a headliner, all your insulation and sound deadener material is covered.
The one piece, which is a different animal, starts at about $159.00...is a piece of black plastic that will need to be cut, covered or colored to meet your needs.
The search function under "post new topic" shows 3 pages of "headliner" related reading. You may get some ideas from these. If you are intersted in creating something unique, the stock cardboard makes a good pattern. There are other materials that can be cut, bent, covered and colored that will give you any look you are willing to create. I prefer tempered 1/8 masonite. It can be bent to form the permanent curves but it's heavier and requires screws to keep it in place.
Once you get the thin liner in place, only you will know that its just cardboard with the original stock appearance. I bought a $25.00 liner, installed it and will use it as a pattern when I have time to design my own 3 piece. Two fixed side pieces with an easily removed center overhead console for some gadgets.
Hope this helps!
