I found the built up posts interesting. I've heard about them, but everyone uses full size pressure treated posts here, but lumber is cheaper than labor still in Oregon. I like how the post sanwiches over the truss, it's double trusses with blocks bolted under here.
I built a 24x36, 3 bay shop. I set all the posts, then would build and roof one bay. The readymix truck could back up into the next bay to pour slab in the first. Then I'd frame and roof bay two, and back the truck into bay 3, etc. This way I didn't have to pump the concrete, could still get the day's concrete on one truck, and could finish a 12x24 without hiring any help. It did take a little talking to get my wife to hold the other end of the rod, when rodding off the mud
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10 feet high works great for deer, but with the elk I had to hook the come along up near the ridge to get it off the floor. If you live in elk country go 12'.
I lived in Michigan a year when I was a young man, they call it stone there too. Here on the west coast it's called rock, I wonder where the line ends between stone and rock. My dad's from Oklahoma, and told me He got teased when He called a wetstone a wetrock, so maybe it's a south/north thing more than an east/west. Lots of people out west came from the south, or like me have ancesters who did.