There's no reason I can think of why you can't make it any way you prefer. Maybe you'll start a trend. It would certainly be easier to handle a large quilt on a domestic sewing machine if the edges were not full of batting, and if you have a warm climate, there isn't that much need for the extra warmth that would come from having it made the conventional way.
When I was a kid, back when dinosaurs roamed the earth, we'd often seen commercial bedspreads in the Sears and Wards catalogs that had quilted tops with gathered skirts attached.
I like the colors you chose. Welcome to the board! Hope you'll hang around and show more pictures of your work.