[67ChevyRedneck]

That's beyond my ability/memory. I've become specialized in site design (zero building stuff), I haven't designed a structural steel member in over 20 years. I was thinking of a stick build, never thought about a steel building.

That's going to need some serious design work. For comparison, a cubic foot of snow weights 10 lbs. A cubic foot of dirt can weigh from 75 lbs dry to 110+ lbs wet. Make that 2-3' deep to maintain a garden and you're going to need some serious structural design. At 1' deep a 40*60 roof would have 264,000 lbs on it wet, make that 2' deep and it would be carrying 528,000 lbs, plus the weight of any crops and the live load of any tractor equipment or anything else that would roll over it. That's some serious weight.