Sparkie,
I did my parents' log home in NH, but theirs' was a "half log" type with standard 2 x 6 construction on the inside. For the outside Fixtures and receptacles to sit flat we'd plane down the rounded face so that there was a flat spot to work with. I've passed up full log wiring jobs because of the unknown factors involved. Let us know how you make out.
Good Luck,
Bill
