This seems to be the new norm these days. I am hoping that we will see some relief by mid next year when my project will start. Since mine will include the foundation for the house and the shop, I am hoping that I can work a good deal with them. Haven't decided on the shop framing configuration yet. I was leaning towards the Red Iron. Originally, like you and many other here, had planned on plywood interior up to 8 foot height. But unless things change dramatically by the time I have to place the order, I will be looking into the shop builder to provide the interior lining like you described.
That is sure a real nice setting for your shop you have there. Are you planning on having windows? While I like the light and the ability to see outside, the windows give me security concerns.