ORIGINAL: Dago Red
There is a company that puts out a 80 inch varieze I think. Its a big plane. Its made by a company that makes scale experimental planes. Cant remember the name of the company, take a look.
That would be Experimental Aircraft Models http://www.rchomebuilts.com/
The plane they are developing is the Velocity. I have one on reserve order but they have stopped taking reserve orders on it until it is released due to the unexpected lead time bringing it to market. It's now due out in Novemeber.
I have three 1/5 scale LongEzes from St Croix, Fusco, and Boxer R/C and a Kerr Longeze. I would guess the only way to get a larger one would be to have the plans blown up and have a foam cutter make the larger cores for you.