I would want at least an 1/8 inch to give some room for surfacing
and resurfacing in the future and to give a more rigid plate to deal
with warpage.
  It may be more cost effective to buy a thicker piece they have in
stock and CNC mill it out and if the surface is to soft hard chrome
or cermachrome plate it.

  Ken

 Ken,
Can you identify what specific stock holdings they have in this particular
line i.e. steel and aluminium.
George  (down under)

 
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