Thanks FuzzyBear - I figured you could get away with less

One of our neighbors has 12" peeled pole ridgebeam and two 6" purlins, 9" center post, and 6" rafters, on his 48' x 24' cabin and that sucker has been up without a creak or a sag for 10 years and is often vacant in the winter so you know it had some snow load!
We'll stay away from the creeks and river groves. Our land is a "fire field" from '69, and there are still some big deadites standing around. We've been using the small ones for firewood, but I was hoping to use the big ones in the house... sounds like they are just the thing for the high stress members. Any issues/pointers if you end up having to build with dry and green together?