Is there any provision for having more than one specification of
mm_per_unit in the globals block? What if I have two separate items that
have different scalings.

Would it be reasonable to expect that something like the following might
work?

global_settings {
  mm_per_unit one-scale
  }

object {
 ...
 finish {
  subsurface {...}
  }
}

global_settings {
  mm_per_unit another-scale
  }

object {
 ...
 finish {
  subsurface {...}
  }
}

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