my neighbor bought just the frame from the carport people, used some longer square tubing to make it longer and taller to make it the size he needed, and bought his own corrugate as money allowed. eventually i helped him weld framework on either end to support a roll up door, and a steel personnel door
cheap cheap. i think he payed $500 for the frame kit.
i have a stick built 27 x 31 pole barn, then used the walls as part of the form to pour the concrete floor. Sure this one i have completed with insulation an 18' roll up door, concrete, and electric it ran $10K in materials, concrete , and electrician not including permits, but on a smaller scale minus insulation, and electric if its storage only it can be done cheap. heres timeline pix of my shop.
