I made a blank dash (with 3/32" material vs stock .040") and rearranged the gauges as many others did (competition dash). With the stiffer dash and an aluminum brace plate (3/32") approx 12" wide, mounted in the center above the tunnel from the dash to the frame, makes the dash pretty solid. The firewall is 3/32" too, to add some stiffness, needed because of the large hole for the heater push-out box.
I also made a heater push-out box (2 1/4" out) and made a glove box. Mine is welded together, but could easily be a riveted assembly. With the push-out, the glove box is 3" deep at the top and 4" at the bottom.
Dash -3.jpg Dash Assy.jpg GB Back View.jpg