FWIW i recently visited a retired fella to pick up some rear fenders. He was working on a 41 Chevy truck in a 24x28 or 24x26 building he built. He had a center overhead I-Beam he used to hoist and lift with a chain fall. But my impression was - that was a very efficient home set up and one I would be proud to work in. Plenty of room to work on a vehicle; had upper cabinets, and a bench-. He had everything he needed within arms reach and room to walk around the vehicle and work. One third was loft - two thirds open ceiling - clear span no center post.
