Wow those door panels look nice. I also did my own, I used the same closed cell padding. I bought it from ebay and it was called poker table foam. here are a couple of pics from the cell phone.
Mine are nothing spectacular as this is my first attempt at interior work but I think they are a step up from stock.
the material is marathon tweed from
http://www.diyupholsterysupply.com/
and was pretty cheap at $10 per yard.