I don't think so. There where a couple of jp using only cardboard around, but to my knowledge Raptorarts was the first one who covered such a project with coats of papermache around here.
Actually, i started before i joined TDH. Here it is. it's not finished, though. my dad recommended i put some patching compound. I think it's called Fix-it-all
Here are some pics of my last layer of paper mache. i added some patching compound, but the results didn't come out good. i then added some paper mache. i think the coatings are about a cm thick.