Thomas, I haven't decided yet exactly what I'm going to do for a "driveway extension" to the location where the new shop will necessarily have to go, although I doubt it will be a paved extension because of not pushing the impermeability numbers. It will either be a gravel drive or, perhaps a variation on that with a grid base system filled partially with stone and the remainder of soil and grass. It acts like regular lawn visually but is more durable for those occasional times I need to bring a vehicle to the shop building. I'm going to do 10' walls, but two of the three options I'm thinking about are open to the peak anyway due to their "post frame" nature.
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Despite the cost, I think I'm going to pull the trigger on quick connect ductwork from Blastgate Company. It will be easier to install and easier to re-use once I have a building. They were really fast turning around the quote, too.