I mentioned this sometime ago, if you go to your local print shop/plans exchange you can have them print out a grid on their cad machine. I had them make it in 1" grid and can be made as wide as 4' x 8' more or less. This allows for you to sit the model right on the grid and make very precise measurements using a right angle to measure down from the CG to the grid paper. I know you can draw out on a table but there is still room for error where as the grid is from a cad and is perfect. Also this same grid is EXCELLENT for checking and adjusting the gear toe in or out. It allows you to perfectly square the fuse up to grid then check your toe in, in relation to the model. Cost is about $25.00 and I had mine clear laminated and I think it will last for ever.