I understand your thoughts, but you would be hard pressed to be able to buy the lumber needed to build same size structure for $60. Figure an 8 foot 2x4 is just a little over $3 each. 17 or so 2x4s don't go very far when constructing a 12 foot shed.Waste of good cattle panels. Too expensive to use them that way.
Build a wooden frame, with purlins, add sheet metal. No need for the cattle panels.