Our local Building and Planning department has a tip sheet booklet on pole barns that effectively ‘cans’ the requirements for an up to 30’ span building such that a homeowner can relatively easily sketch his own ( often cutting/pasting from the tip sheet booklet for details)-you might check and see if yours does the same.
My 40x60x14 required stamped plans- the contractor who won the bid had, at some point, contracted a local PE to create a drawing which covered an entire range of spans, heights and lengths-you might see if a local PE has done something similar for a local builder who might sell you plans at a reasonable cost.