Back in the summer my neighbor needed a big oak tree cut up and removed from her yard. It was about three and a half feet wide. I saw the opportunity for foundation pillars. At the time I quartered the big pieces to get them home. I've been working to turn these quarters into 12"x12" pillars for the temporary foundation on which we are going build the log shell. I'm treating the bottoms and sides with penetreat and a home made stain to protect against termites and rot. The tops will be trimmed later to 8"x8" to represent the permanent foundation wall thickness.