Hank, what kind of headliner material are you looking for? Look in JC whitney, they have some stuff. You can use almost any material you want for the headliner, just back it with some foam and put it up in. Doorpanels can be done simularly. Just get some thin backing board, from plastic to plywood will work, you can cover it with almost any fabric/leather you want with some adhesive and padding. If you need a bit more guidance let me know, glad to help. My e-mail is in my profile, or send me a PM.
HK