Some of the very cheap Chinese strat copies you see on Ebay have bodies made of MDF. I'm talking about the extremely cheap ones. A friend of mine bought one for £39.99 and brought it round to me for setting up. One of the pickups wasn't working, so I removed the scratchplate to check the wiring, and hey presto, the body was made of MDF with a polyester type coating. There was a wire off the pickup selector, which I resoldered, reassembled the guitar (did some fret levelling!), and it sounds quite reasonable, although not brilliant, due partly because of the crap pickups. They have a DC resistance of just 4k, and are as light as a feather. I wonder how it would sound with a set of Iron Gear pups...