Input on new shop

[RPOLS3]

If you are not using the attic space for storage I'd go with the engineered trusses - they can make pretty much anything you want in terms of span, pitch and ceiling clearance. I'd also think twice about having those walls in between the bays as I think open space seems to work better over time. As your use/needs change you are not encumbered by bearing walls that get in the way.