Planning a shop build, any suggestions?

I agree. I have built 2 pylon style pole barns. Way better than a standard pole barn. 1 had wood poles and the other red metal.
But if your going to build a pylon style barn, might as well just purchase red steel/Isteel/structural steel. Build the main frame out of metal and connect wood to that or continue with metal purlins/girts/bracing etc. A full metal building that is pre ordered to be set on concrete pylon's can actually be a very reasonable price.
When comparing price to price, the taller you build the more efficient metal becomes. Metal allows taller spans.

I agree steel is better, but the cost tipover is the concrete. Pylons and a 4" floating slab cost way less than a well done
"foundation" for a steel structure.