Need Help Finding a Reliable Builder Near Columbia, MO

I'm starting a new 25 acre permaculture project near Columbia, MO with some family members.  Does anyone know of a reliable builder in the area that is both skilled at designing and setting up passive houses as well as knowledgeable of the design principles of permaculture?

I'm in Columbia and have some friends that recently had a passive solar home built by Robyn Magnet. He has done many in the area and has a great reputation. They said he is trying to retire though so may or may not be available. Can't say anything about his permaculture knowledge but he builds a good house. PM me if you want contact info.