Tony,

Do you have an idea what your target weight will be?

If you have a target weight then all you need is wing loading to calculate the wing area:

Wing Area = [MW / WL] x 144

Where:

Wing Area = in2 (square inches)
Model Weight (MW) = oz (with fuel in tank)
Wing Loading (WL) = oz / ft2 (square feet)

A lower wing loading (4-6) is more like a glider where a higher one is more like pattern planes (20-25). I would probably choose a wing loading around 8-12 oz / ft2 for Mopzilla. Maybe someone else can chime in a more exact wing loading number for an .061.

Brian