You're welcome!
I believe that this is the house I was talking about, which was the first permitted hempcrete house in the US. This video is from Nov 2009.
Once it starts to gain more acceptance as a building material, the fixed costs of building a house can go down dramatically, especially if the owners are willing to do much of the labor themselves.
This house has relatively thin walls, but the build was in Asheville, NC, which is in the South, and thus not subject to the weather extremes of the Great Plains, for example.