Cover looks nice.
If the boat is stored outside and it is a year round cover, I would not have cut out the swim platform. Debris can collect there not to mention sun fade and degradation of seadek.
A center pole may also be necessary. I see you are "south" but any snow load will stretch the center creating a low spot.
If there is a low spot for any reason; water will pool and drain to the interior below. Mildew will not be far behind and you will be starting one of those "I cant get the black spots off my vinyl" threads. FWIW.
1991 MariStar 240sc, 454, tower, WetSounds, Krypt and Rockford Fosgate