1/2″ just increases moving mass and slightly decrease your z range. No other issues. You could do some cool things with thicker bases like route in some vacuum channels and things, but it really doesn’t matter. If you take a look back at the assembly geometry the only flex is basically between a screw/bolt hole and it’s neighbor. A very thin piece is fine. The 611 shoe takes up a lot of the overall area.
The only reason I mentioned thicker is to counter sink the screw heads