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I would go with metal. There are alot of choices when it comes to panel profiles and finishes, unless you purchase a complete turn-key which includes everything(purlins, girts, columns, openings, roofing/siding, and flashing). Even those allow for upgrades. Most "garage" size buildings use an R-panel or 1/2" corrugated profile for their sheeting. But other profiles are available for more $$$ You can go with blanket insulation in both the roof and sidewalls and run an interior liner panel for the sidewalls for insualtion protection and increased versatility(hanging things, etc.) the liner doesn't neeed to be full-height, just 8' or 10' would suffice.
Depending upon your needs, you may want louvers/intake fans in the sidewalls and a roof vent or exhaust fans in the roof to move the air. Thicknesss of the panels (gauge) will depend upon your structure, but the lower the gauge the heavier-duty the panels. I wouldn't go less than 24 for the roof and siding(22 would be better). Many pre-fabs use a 26 ga. as a standard.
Smaller buildings can be completely assembled using an extendable reach forktruck(lull) for everything--column setting, trusses, purlins, girts, etc.
Hope this helps.
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Eric
83 911SC/83 944
bunch of Honda 750s
69 Chevrolet C-20 Longhorn (family heirloom)
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