I haven't gotten to this point in my LT-40 build, but I'll lay out how I balance for you. I do it a bit different than others in that I will balance the plane BEFORE I cover. I completely assemble the plane with no covering on it. I then balance the plane. One of the best things for adjusting the balance is changing the location of the battery. In a plane like the LT-40 where there are TONS of rooms inside of the fuselage you can more than likely do all of your balance adjustment with the battery alone. Anyway, I do both the CG balance and the lateral balance of the plane. I then sand and cover the plane, and a final check of the balance of course after it's covered. I do it this way because I had having to cut covering to add weight to a plane after it's covered.

Hope this helps

Ken