Log walls should be drilled for wall outlets on the first level and likewise for wall switches by entry doors. Then, provided an electrical box is on-site to use as a template, the logs are notched out for that piece. So, by the time the shell is complete, the log walls are electrician ready. Neither plumbing supply nor drain lines should be installed in an exterior wall, whether those walls are log or framed. Those lines should be installed under the home.