It seems to be working nicely. Here are pics of the mods: 3/16" steel sandwiched, y-axis supports, thicker, longer spindle mount with three wheels.
Spindle Mount: http://garritanoreunion.com/rexel/rigidity/IMAG0681.jpg
Sandwich: http://garritanoreunion.com/rexel/rigidity/IMAG0683.jpg
Y-Axis Support: http://garritanoreunion.com/rexel/rigidity/IMAG0684.jpg
