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Sorry, Koenig, but your picture is too small and dark for me to be able to see much detail.
For now I would leave it alone. Next spring I'd put it into a wider but shallower container; you want to prune off any roots directly under the trunk as you do. This will encourage development of the nebari.
Using an obtrusive scar in your design is a creative, and for me, very satisfying way to deal with it. So if you want use that old pruning scar as the starting point for a hollow trunk, I say go for it!
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Treebeard 55
Steve Moore
http://hoosierbonsai.blogspot.com
The most important bonsai tool is your brain.
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