We've had some really beautiful weather here in North Carolina which has allowed us to really make some headway.
With the french drain and foundation size and width determined we had three flatbed loads of field rocks delivered. A local farmer had been saving them up from his field clearing for growing corn. He was local and he gave them to us....just had to pay for delivery.
It's really important to determine the height of the foundation wall as you want to be sure to prevent "splash up" from rain. And since NC gets its good share of rain we wanted to maintain the wall integrity for future cob/lime plaster. We also increased the roof overhang to 4 feet. You can see the cedar poles outside the stone foundation we planned for the extension. The interior loft logs were installed so we could build the cob and straw bale walls up to the logs (which were also donated from another local farmer as he was clearing more land to use for farming). If you're new to the area always check in with the locals as they can look for or even donate free materials for you. Remember you should be trying to keep your cost down while reducing the carbon footprint, sourcing local and re-purposing materials.
The roofing materials we sourced was from a local saw mill. They gave us all the cedar slabs we wanted (slab is the bark sides cut to make a square clear log to run through the saw blade....mill usually "BURNS" these slabs). All we had to do was go pick them up....yeah!!! We ran the slabs through our table saw then handed them to the guys installing the interior portion of our roof. We did have to buy 10" wide wood for the rafters. Installed "friendly" 10" thick insulation. Finished with a metal roof.....unfortunately the June heat on installation day was 96 degrees!
NOTE: Just wanted to mention that when building the rock foundation we had to really build two walls meaning that there was a space between the outside stones and the stones on the inside. We filled this space with various materials i.e. anything non-combustible.....rocks, urbanite (chucks of broken up concrete), glass bottles, styrofoam packaging etc. When foundation is built to get the flat surface needed to place the straw bales on we used cob.