[MichaelHenry]

I highly doubt there would be any flex as long as it's supported well. But I really don't think mounting it on risers would be a good idea. one of the beauties of the plate is that it has alignment pins that align it to the table and this would be lost if mounted on risers.

Good point on the alignment pins. My concern with rust was more for the table than the subplate and it seems likely that sooner or later coolant will get trapped between the plate and the table.