Hemlock Paneling

Hey all,
I am finishing a 3-season room addition to my cabin. Much of the exterior is rough sawn hemlock from a local Amish mill. I would like to continue that rustic look on the inside by butt-jointing rough-sawn hemlock paneling on the walls and ceiling much like the 100 150 year old barns in my area that are constructed of hemlock.
This supplier can provide boards up to 20 in. wide and as thin as 1/4 in. Because this addition is constructed on what was previously a deck, albeit a very sturdy one, the overall weight of the structure is somewhat of concern and I'm considering using thinner boards in the neighborhood of 3/16 in. I've used 1 and 2 in thick air-dried hemlock in other applications, so I'm well aware of the shrinkage that can occur.
Does anyone have any experiences using air-dried, rough-sawn hemlock for this application (i.e., what is the minimum board thickness I should consider to minimize checking, splitting, etc.?)? Are there any other potential problems I might encounter?
Thanks for any suggestions, Dave
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Think about going board-and-batten. That should protect you well from winter gaposis. Don't want to be around the first time you try to hang a picture on a nail, though. Dry hemlock is a challenge!
If your barn-builder did it right, he restrained the center of the board with a single nail and allowed the battens to restrain the edges. Keeping the heart toward the inside made for more weather-tight barns as the edges rose to meet the battens.

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