HAVE YOUR WELDER MAKE 4 TO 5 FOOT EL BRACES OUT OF 1/4 INCH X 3-1/2 INCH ANGLE IRON AND USE 1/2 INCH EXPANSION BOLTS INTO CONCRETE EVERY 5 FEET . uSE DEEP LEG BOTTOM TRACK AND HORIZONTAL 1/2 INCH PLYWOOD UNDER ROCK WALL BE STIFFEN QUITE NICELYThanks all for the tips...I really would like to use some sort of an iron post drilled and bolted to the floor however. Just not sure where/how to purchase/install them. One idea someone gave me is to construct a vertical box beam at the end of the wall, drill a hole into the concrete and install a piece of rebar down the center and fill with concrete. Sounds pretty labour intensive but I think so far it's the best solution.