The Insulation thread led me to this thought.
Build a wall with a top and bottom plate, and stagger 2x4 studs at 16" on center, The inside studs on the inside are 16" o.c, the studs on the out side are 16" o.c. Install 3-1/2" on the outside wall, run your wiring, no drilling then add 6" on the inside. Works great, and all the inside insulation covers the outside studs so there is no way for the cold to transfer through.
We did this in a few villages, but don't hear to much about it being done anymore. The cost is not that much more, and to me its the way to go.