The "wigwag" elevator hinge point is at about 224.5". The aft of my fuselage is stuffed back into a corner and difficult to reach.
Take a blue masking tape and run it along the fuselage longeron from front to back. The LE on the wing is at 70" by definition. Mark off any point square to the longeron and write it on the tape for future use.
Note: the CG of the elevator is also not at the hinge point, it is 1-2 inches aft.
calculating a W&B is difficult at best.