Most rectangular buildings only have four walls, but to keep things interesting we added a fifth -- running down the center, it supports much of the roof, and will allow us to have clearstory windows in the middle of the house.
The center wall is essentially a 24" x 6" plywood box beam, supported by 4 6x6 posts.
The top of the wall is exposed on one side, so we've insulated it.
Russ and Bart fit plywood to the box beam.
Russ inspects the post.