Personally I would stick with a poured foundation.
As far as plumbing I had to go with a cheater vent under kitchen sink, no partition wall close enough to vent up thru , so keep fixtures along interior walls if possible. Also installing baseboard heat was the hardest part, getting them tucked into logs, but mine are hand pealed inside so flat logs would not be an issue.
Helped my cousin build his cabin and he drilled and chiseled for outlets. was pia. I used wire-mold and looks good and easy to do.
Keep vertical joints to a minimum. My logs were 16' plus . Saw a cabin that a builder put up and they cut all the logs into shorter lengths to make them easier to lift. Not kidding.
As others have mentioned the caulking is important to maintain , the most important in my mind. Mine needs some touch up . The petroleum based stuff is no longer available and it worked the best. Local store stuff not so good and fails due to the expansion/contraction of logs. Fall is the best time to seal your cabin.
If your build has rigid insulation on roof some only use 2". I recommend going with at least 4" , vapor barrier underneath and an airspace w/full soffit and ridge vents.
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Leo
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