Thanks for the pictures. Scenic and relaxing Lake Gaston. I didn't see your boat.Jeff here is a picture of the deck. The grill would be on the right side.
You could still put a partial roof over a portion of the deck where the grill is (on the right side of your 1st pic). The rafters tie into a few of your existing roof rafters. 7 rafters @ 16" oc would be about an 8' l area.