RE: BRIO CG-BALANCE UPRIGHT or INVERTED?
Well, I think that altacom has a much better answer than I can provide, but since you asked...
Take your two index fingers, lift the plane about shoulder-height. Use your elbows against your stomach to support. Move your fingers back and forth until the plane is level- balanced (fingers intersect the fuslage/wing root at the underside) and then when its set use your fingernail to put a mark in the wing. Then put the plane down and measure from that mark to the LE- straight forward. Simple but effective and accurate to, say 1/8 inch.