Very cool quilt! I would probably add borders just to finish it off, at least on left side and bottom- it just looks - not quite finished. The top and right looks finished. All the way around will probably work-before committing to 7” all around I would fold my chosen fabrics in the sizes stated and lay them out around it- audition first to decide if you really want to do that much more.
what ever you choose it is a really great quilt!