My brother has built a few large log houses in the last few years-He understood the problems associated with elec. installs, and augered the logs lengthwise, that is, cut a v-shaped groove down the length of each log on the bottom,(This is necessary for certain other reasons) then, he cut areas for outlet boxes where appropriate, and ran a length of rope between each of the holes, and tied a small stick to each end-thus, the walls were pre-fished, so to speak. The Electrician was most appreciative of this. See if your builder will take this simple step.