Since the Shinden has an EXTREMLEY small fore plane you're going to find that the CG location will be well back and likely somewhere on the first 10 to 15% of the main wing's MAC.

To get a feel for this try out this Canard Calculator;

http://adamone.rchomepage.com/cg_canard.htm

An all balsa chuck glider might not be a bad way to go to get a feel for the CG location as well. Something around 12 to 16 inch span with a flat 1/16 main wing and a 1/16 forewing with some "Clark Y" sanding done to the fore plane to give it a hint of camber. Make the fore plane angle adjustable by some means and play with the CG range to find out where it has pretty much neutral pitch stability. IE: When it stalls slightly it drops the nose and dives in with little or no attempt to recover.