After all these years.....I finally added the Jack Slip to the sawmill. I have been working on the interior of the mill, trying to get the equipment lined up, and the chain drive figured out. Turns out I don't really need to in order to complete the jack slip. The Jack slip was a chain with cogs, that brought the logs into the mill. The side pieces are made up of laminated wood on its edge. Most had a walkway, etc.
I also managed to get the last part of the roof on. More details as time permits.