Insulation of walls in log cabin

[thefluidaffect]

Hello,

I am getting ready to insulate and rebuild some interior walls of a cabin. The cabin is 3-sided Spruce logs with an average width of 7.5 cm at center of the log. Old construction with lots of gaps between logs (will be sealed with chinking at a later stage). My initial thoughts on how to go about this were:

1. Permeable vapor seal tacked to logs
2. EPS foam (5 cm)
3. AAC blocks for interior walls (non-load bearing/ 5 cm)

I calculated this should give me an R-value of approximately 15.5 with good thermal mass. But, I am not sure if I need the vapor barrier (house wrap) on the inside of the logs before EPS styrofoam or if this would cause problems with moisture.

Thoughts or suggestions?

Thanks in advance.

-Carl