If you are doing full log homes rather than log siding..........   I use a single layer wall (transparent material) the thickness of the Logs.  If you want chinking you can make the original wall 3 layers with only the outer layers being transparent.   I place all windows and doors in those walls which provides the casings, etc.  Then I stack Log Symbols just as if I was building the log home in the real world.   This is the most realistic method I've found.