I recently went through my pile of interesting RC articles and dug up one from Scale RC dated 1992. It featured a high wing plane built by Carlos Rangel, it was constructed entirely from thin sheet aluminum. The article does not provide any real details about the construction other than the fact that common full size techniques were used.

Carlos is on the web at http://www.stolaircraft.com/heliorc.htm, you can see a couple photos of him and his plane