I bought 3 digital scales for 30 bucks apiece and find CG the way they do on full scale aircraft. Visit the Jet Pilots Organization web site for the spreadsheet with all the formulas. Takes three measurements and then three weights ... one on each wheel. Works with any size aircraft with no hanging.

There are several spreadsheets out there for various planes.

www.jetpilots.org pick the members tab and then weight and balance from the sub-menu. I am getting ready to post more spreadsheets this evening.