Is it too 'unmanly' to force sitting down when using the head? You could set it up like your dinette, so there's a step up to the business part of the head - throne-like, you might say. Then you could see out the dead light while taking care of business if you were so inclined. You might be able to recoup some of that storage under the head. On second thought, maybe you don't want anything under the head except a holding tank.
That would leave the after area accessible for storage or a hanging locker as well as the area under the deadlight against the hull...