I've used UF cable in the chases between the mesh of the chinking, if you're speaking of "real" log homes, and not the new "manufactured" log homes. If you don't have space under or over the walls to sink a long drill bit in (72"), then you're in for a fun time. I've succeeded in drilling at angles in each log to go vertically.
I also recommend spending the extra time to recess the boxes into the logs, rather than putting them in the chinking. If the logs are squarish faced, it makes for a better looking installation. 1-1/2" Hole saw and a sharp 1" chisel will help in this endeavor. Use LWX metal boxes and feed one cable from a junction box to ease the "pain".
Cabins are a wonderful challenge...
Note.. always quote them as "Cost Plus"
[This message has been edited by sparky66wv (edited 06-27-2001).]
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