If it were up to me I would lay up a nice dry laid quarry stone perimeter foundation and ste the frame on top of it, but the codes wont let that happen.Very interesting designs Daiku. I have actually never seen it like that before.I noticed there is not a sill plate? does the floor truss design replace it? What about poured concrete pilasters at the point loads in the frame and the 8" stem wall in between them. Perhaps someone could chime in about ICF foundations and if they might be used with timber frames, they always sound so alluring as they have such insulative qualities and the formwork is much easier and less labor intensive. tb