I don't think I've ever seen one of these in person. I like the price, but are parts available for AMCs, like floor and trunk pans and quarters?

http://stlouis.craigslist.org/cto/1271777369.html

This place carries some of the parts for them.
http://www.americanpartsdepot.com/BodyandBumpers2.htm
I had a 70 Javelin in High school. If I remember correctly they were pretty easy to do body work on. Due to the window track/guts being removable in one piece the usual hard to get at parts were wide open.