Yup, special fireproof copies of the local paper
Nah, i forgot to say - remove the paper mâché before you upholster. Or not I suppose, I did because it bowed a bit and needed to be trimmed to fit in the car, but if yours is sturdier (I didn't use enough layers) you could feasibly leave it on. Could add stability.
Blooming comfy though - a world away from the tired bench seats I had before and a LOT cheaper than Tillets!