Where in the world are you located? You say it must be strong enough to hold a few feet of snow, what would you say is the average snow fall around your area?
I only mention this as i think it could solve your problem:
We produce a wide range of prefab steel buildings of all sizes. They are constructed by bolting light weight steel arches together. It can easily be taken apart and reconstructed on a new site.
Just get a few of your buddies round and you can get the structure up in a few days. Also, snowfall is not an issue!
checkout our website
http://www.futuresteel.com
Hope this helps!
