Finished trimming the mousehole for the tailwheel mount. Marked and drilled #30 holes in the mount through the bulkhead. Measured and drilled the #40 keeper rivet holes through F712. Clecoed F707 and F708 to the bottom skin F778. Devinyled and marked the centerline on the lower 4 J channels and put in place. Clecoed on the sideskins. Finished riveting F706 together