stamped drawings for replacing windows in three locations in a house. I have drawings and pictures that I can provide. But I'm not an Engineer, and city permits need them stamped. -- 2

I need help with replacing windows in three locations in a house. Fortunately, I have both drawings and pictures that I can provide to the project. The windows to be replaced are standard size and I have a flexible timeline for completion of these drawings. That being said, I need professional help as I'm not an Engineer and city permits require the drawings to be stamped. I am looking for an expert to assist in this project. The 2"x9" window header is a concern for the city, but it has already been sheet rocked in by the former contractor (it was three separate smaller windows). The downstairs 5'x5' is a new window, where a wall was. The bathroom is getting a small remodel, and going from one window, to two.