RE: Where would I put my CG?
Pimmnz's method may well be an effective shortcut, but it's not one I'm familiar with so let me ask you something:
Are you comfortable calculating the exact CG location for each wing independently? If so, you can simply "average" the two locations PROVIDED the two wings are of the same area. If they are not, each CG will have to be weighted according to it's area.
If you prefer, I have no reservations about calculating it for you. I just need dimensions.
Regards, Don.