HerHusband writes:

2. Utilities. As with a traditional log home, where to you run the
plumbing, electrical, and other services? You would either need to build a
secondary wall on the interior to provide space for these (negating the
advantages of the system), or restrict utilities to interior walls. I
suppose you could use surface mount conduit for electrical, but that's not
a good option for plumbing.

It is quite common in the UK for the sewer and water lines to be on
the exterior of the house, in areas not subject to freezing.

The french took it to the extreme with the pompidou center in paris.

scott