Anton, "fast growing" and "structural wood" are pretty much mutually exclusive terms. Most fast growing wood is unsuitable for structures unless processed to fibers and reformed with glue.

__________________
In your rush to call everyone "entrenched" or closed-minded or "limited" you fail to note that the "limit" here has a very natural boundary: that point at which the evidence stops. - JayUtah

Science fiction was never meant to be an educational tool. - Editor Amazing Tales