Mike, I'll second Steve's message, thanks for the great pictures. The shop looks super.
Thanks for your comments on the east wall rebuild idea. The side door will stay where it is so we don't have to re-frame it. We are going to use 4 new windows on the rest of the wall. As you said, the spacing may differ if we build off of the old 6X6 uprights. I think it would be better to keep the window spacing the same all the way back so we will skip the section with the door but measure like there is a window, then install the first window in the next panel.