We had a timber frame house erected in central NH during summer 2004 using EPS -SIPS from Branch River, Smithfield, RI. The wall panels were built to match the nominal 2 x 6 wall thickness on the outside and 2x 10 on the roof. Since the timber-framer had a crane truck on site for the timber frame (oak, pine, birch, maple, beech) mob for the crane was already incl.

A few thoughts:
* Having viewed some SIP-built houses with unsightly cracks, our T-F went with OSB on boths sides of the panels. Blueboard was placed over the SIP edges. This practice virtually eliminates "reflective cracking" bewteen SIP edges and allows you to screw into the OSB (cabinets, shelves, etc). Don't save with having only drywall on the inside face.
* We went with a 39 x 32 footprint on the main T-F house. The 40' front overlaps the side 32' dimensions to minimize waste.
* Our T-F divised a system to run 1st floor electric along a 12" high chase with 2 layers of foamboard on the outside. The SIPs sit on this 12" chase.
* Provide plans, heating specs, etc. to obtain EnergyStar certification - it wasn't too much extra work.

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