When I was looking into building types, the steel constriction I liked best was Miracle Truss. They have a clear span with wooden purlins so a Do It yourselfer could source material local and save on shipping. Allowed for traditional interior and Exterior finishing.
Miracle Truss 
I have Miracle Truss garage that I built myself around 15 years ago. Did everything myself except concrete.
It took me a while to assemble but it wasn't hard just tedious. Mine is all steel except the purlins. If I could do it over I would do traditional exterior and of course build one 2x as big
