Normally the area from the rear spar back under the turtledeck is left open. But I don't like this unfinished look. And it can't be very aerodynamic. So I came up with a simple sheet metal fairing to place over this area. Started by fabricating two aluminum angle stiffeners to rivet to the turtledeck. Then fit the stiffeners into place. And drilled, deburred, and riveted to turtledeck. Installed turtledeck. And fabricated the sheetmetal fairings. Drilled up and screwed into place with small pk screws.