I've been researching SIPs again lately after deciding to "bale on straw" (ha). I think SIPs are way cool, high tech, strong, easy, minimal material, yes spendy, but not necessarily if you factor in labor. HOWEVER, SIPs are redundant in a timber frame home. Like Mo said before "2 structures?", what?! That just seems silly. Timber frame just for looks? not.

Your method sounds cool Tim. Seems minimal, strong, easy to do and attractive. Got any pix or diagrams? I need a wall system.

tx

Oh, btw, check these guys out. There may finally be an alternative to petroleum based foam board:

http://www.ecovativedesign.com/greensulate/why/

I talked to one of the engineers. They expect the product to get final approval in 2011.