I'm building a post and beam with log infill from my land. I did, however, get the logs for the posts from Heartwood log homes when they closed their place out here in Colorado. These are Eastern white pine and about 12". The infill are my Ponderosa and Engleman Spruce and I have a few Douglas Fir for beams and interior supports. My guide is"The Craft of Modular Post & Beam" by James Mitchell - building log & timber homes affordably. Good Luck.