C.A. makes a 24% Extra 300L kit. It has a 73 inch wingspan. C.A. model Extra kits come with pre-sheeted foam wings and turtledecks and all the wood in the kit is laser cut. You can get more information on them from:

[link=http://www.rcsuperstore.com/products/Airplanes/CA%20Models/e300l.htm]RC Superstore[/link]
[link=http://www.planesplus.com]Planes Plus[/link]

You can also find a lot more information and building tips on them in the Giant Scale forum by doing a search for 24% Extra.