Hey daiku!

Thanks for posting your plans. To be honest I haven't gotten this far down the process yet, but had thought about a similar size and construction. I definitely want to avoid directly exposing the pine in the sauna for the same reason you stated. I'll look into the white cedar as well, I haven't used that before.

Zach, as for my plans on finishing, I'm going to go with post and beam, but I'm still unsure with how I want make the walls. I've been reading a Sauna book by Rob Roy and looking into cordwood walls, and I've also thought about stick built walls. Doing cordwood walls does have one advantage for me in that my wife likes the look of them and would like to help build the walls if we end up going that route!