you guys were balancing by first weighing the load on each main and the tail wheel as referrence?
As long as you like doing a little work -here is an easier setup:

Weigh completed wing assy and find exact cg of THAT ass'y
transfer that point to the fuselage. (a dot of ink)
set wing ass'y aside.
Make a couple of weights that you can hang to the fuselage- which represent exactly the weight of the wing ass'y.
affix the wing weight to fuselage at the point marked --I sling it in two bagggies, hung over the fuselage and secure with a piece of tape.
Then,build and move stuff as necessary to get balance close to this point (c/g).
A wing ass'y is typically only 3-5 lbs on a model this size -but is awkward to use during balance tests.
using this setup -I can easily check c/g as I go.
This procedure won't work well on a full scale B36 -but then again - these are models.