Rather than the middle board being solid, couldn't you achieve the same result with a vertical 2x6? Spaced at 24" on center? Alternate the layout with the board above so you have roughly 12" on center stability when fastened. Fill the void with insulating foam.I always wanted to use this method to build a small cabin, much easier than lifting logs
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How to Build a Small Log Cabin - Tiny House Blog
I have always wanted a log cabin, just some little place to get away with my thoughts and relax.tinyhouseblog.com