Just saw this thread. My 25 X 26 shop is metal. I’m in central SC with plenty of moisture but no condensation issues have developed.
Rather than drone on about my shop, I’ll let you ask the questions. I will say that I’m 100% happy with my all metal shop. Installation took 1 full day by a 3 man hard working crew. I hired a company to spray closed cell foam insulation on the ceiling. I hung the plywood interior walls myself. Then I hung the electrical conduit too.
Here are a few links to view. Construction video time lapse
Another video Lift installation
Foam insulation video Insulation video

1965 Chevy C10 Shortbed 1/2-Ton Stepside
Truck College
In the Stovebolt Gallery
In the Project Journals Forum
The Build BLOG on Weebly
T5 Transmission Build page