Hi Harold
Just saw your post. Dug out an assembly manual, that sez the target CG is 1 7/8" back of the leading edge. I never measured my two, just assembled them and went flying - the balance came out good naturally.
Here's a couple pix of motor & installation. I used the pocket in the fuselage to stuff all the excess wiring into, then still added a foam pad to get the ESC just above the surface for cooling. This one shows the timer held on with two screws, but the other one I built (and almost all of my profiles) I attached the timer with some double-sticky sided foam tape.