I'm a wood guy. I like to build wooden buildings. My only use of metal is for roofing, which I attach to wood purlins. I suggested to my client that they reconsider building with metal and look at wood, but that's not what they want.
The company that I like to buy my metal roofing from also sells all the metal for metal buildings, but they just sell the materials, they don't do any of the work. I suggested that they go there and ask for a list of contractors, but they haven't done that. It's a shot in the dark if you get a good one or a dud, but it's a place to start looking. They want to hire somebody that their friends have used before, but they don't have any friends that have done this before. It's a very odd conversation with them, but in the end, I'm sure they will figure it out.
If I was wanting to build a metal building, I think I would go there and ask for a list of long time contractors that have been around for awhile. Seems like they are the ones who get the job done. Getting it weathered in would be the main goal, the rest can get done later.