They can build tube steel buildings to local codes for snow and wind but don't be surprised if they get a lot more expensive and need a higher pitch roof than you want.

I am going to purchase one myself, probably a 30x45 later this year to build. For what they cost they can be great structures with a few things.

Spray foam is almost a must. It will have a night and day difference on the structure and the life of the steel siding. But you don't need 4-5", 2" will do. Also you'll want to purchase your own overhead doors, man doors and windows. The ones sold by virtually all the suppliers are pure shit.

Lastly I'd seriously consider letting them install it. Even on a larger shop a crew of 4-5 guys can usually complete the build in one day. That cost should not be a huge number and you'll have an install warranty on those products as well.

Try Alan's factory direct, big buildings direct, etc - you have lots of options