Scott:
This is the only picture I have from the magazine, maybe I can get another:
View attachment 100949
But you are roughly at the first picture on the right, the one marked '80.
But look at the partial photo to the right of it, marked '76. See the bit of wood with the concave carved end?
I believe Ebihara did that to his zelkova. Removed a good bit of the heartwood at the very beginning. Then, once he got the buds, and selected the ones to grow into his main branches that we see in the 1980 picture, he had carved V cuts in between them. Having the center carved out before made it much easier.
My question would be "what about the water in the cup of the trunk?"
In the 1983 picture, there appear to be more branches growing towards the interior of the main ones pictured in 1980. I wonder if he grafted those in?