Replacement Deck design

We have manufactured home that had non attached unsafe deck. County told us if non attached did not need permit. We took old deck out. Found out morning of commencement we did need a permit; Engineer is NOT required but now that we are going to have inspections the contractor won't begin until we have engineer. We were supposed to begin a month ago. Husband is disabled and we need the deck in asap w/ the ramp. Very small project (18' x 15", covered w/ 3 steps and ramp)