A double truss is one truss on each side of the post (just one on the outside of the post on the ends) for a total of 10 trusses for 60'. I used joist hangers to attach 2x8 perlins in between the joists. I set the poles and attached the 2x6 side girts first. I then poured the floor to have a nice work surface. We then built up the trusses/perlins for the center 12' section and end sections on the floor. I bolted winches to the top of the posts and we ran them with cordless drills (handles removed) to raise the three sections. I calculated each section weighed about a ton! Then came the hard part....filling in the perlins between the sections. Then the gable end girts were put on and it was ready to enclose. I used a 2" insulation blanket on the roof. It comes in a roll 6' wide and is cut to length. We rolled out 6 ft at a time on a CALM day.
I then trimmed out the windows, doors, eves and base before I sided it.
I dropped the lean-to down 2 feet so that I could use 2' precut light panels above it. The slope was determined by the snow load required using 1 3/4" x 9" microlams for the roof. They cost almost as much as the trusses!
The lean-to was a great help when roofing the main building. I temporarily nailed waferboard on it to work off of. My loader only reaches 8', so I was able to lift materials up to the top of the lean-to only.
All steel was ordered to length to the inch. A local company forms everything from a roll, so any lenth is possible. They also formed any special trim that I wanted. I bought a slider kit for the door. It is all steel and aluminum channels making it lighter and stronger.
I also wrapped the lower 6' inside the building with waferboard to give nice nailing surfaces and discourage theives from breaking in.
I designed the building with 3' steel in mind, so I never had to cut a sheet lengthwise except for around the doors.
I live near Spokane, WA.