Sounds good Kenny.On my original shop I just put 1.5 foam on the outside(polebarn). when I added the small addition I built the walls in between the post like you did, That is the way to go. I scabed some scrap OSB off our jobsites for a while and put that on the inside. It took me 47 peices to do what I could have with just 8.5 full sheets of osb. But it was FREE, and you can't tell now that the many,many,many coats of paint are on.(amazed me at the amount of paint that osb can suck-up).
That looks good and I am having fun planning my new build. Thanks again for sharing.
Chuck