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No penalties incurred according to my rule book. To turn an object to
a desired design is what the rules require. In your case, the book
clearly states that if the designer intends for the object to be a
stand-mounted ornament of a weight greater than the average tree can
support, it is allowed. Hollowing or not and wood species are not
designated.

But who are you kidding. A quad axel figure skating jump is not a
required discipline in the figure skating rule book either, but the
skaters go for it because of the challenge. So, turn a solid, mediocre
quality piece. Legal, but boring.

On the other hand, if we are talking about commerce, then the game is
different. Legal and boring in the commerce game is called efficiency
which leads, potentially, to higher margins.

Joe Fleming - San Diego