There is a number of online CG calculators out there. Links are in the sticky resource threads at the top of this forum post titles. Input the numbers for the design to get a good idea of where to start. The oddball wing shape of the Condor will require a bit of fudging to come up with a good "straight wing" equivalent root and tip chord and equivalent sweep angle. But even if done roughly it'll still give you a darn good idea of where to start for your initial CG location.