Seeing as nobody can provide a sample of "gopherwood" or any of its physical properties, setting it's density to be the average of known woods is a big leap of faith.
Not a big leap of faith at all. Seems to me to be a reasonable place to start and see if there is a great deal of sensitivity to the density.
This is the science side of the debate forum, calculations and requests for them are to be expected.
Yes, and both sides should be prepared to supply some. I see you started with a bit but didn't finish.
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