How much live material you leave would depend on how much growth you wish to
maintain from the remaining parts of the trunk obviously the wood you remove
from the middle will have no affect on the trees growth. If you are removing
live material lengthwize up the front of the tree lets say, then you wouldn't
have any live material to concerned with, because you would be removing it
anyway. sounds like nice design.I would love to see it when its done

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