16x40 shop . Concrete slab was hired to a Concrete subcontractor by homeowner. It was a mess at 1.5 in out in 40' along with ups and downs . I shot each stud with a laser level and cut each stud individually to get a flat roof and boxing . T-111 siding with metal on the roof with underlayment. The homeowner helped me get the plywood and metal on the roof . I did this by myself also as I do all the work you see in these pics .