I called a local mazda dealer's service department, seeking a second
  opinion
  on
  my used rotors. I was told by the service writer that dealer service
  depts
  do
  not take down engines, they don't even know what things inside look like,
  they
  just get a new engine form Mazda. Hmmmm.
  Does anyone out there who has the experience of rebuilding a rotary make
  inspection measurements as called for in the shop manual? During
  cleaning I
  found some "minor" dings and dents, and some burrs along the edges (not
  seals)
  that I carefully stoned out in a 2 step process, med-fine, then very
  fine.
  the
  rotor housing clearence passes minimum of .1mm. but there are still some
  cosmetic issues where some knuckle head used a brass hammer, and a couple
  other
  dings. Would anyone here care to see pictures and offer comment?
  Will be posting turbo manifold this evening, along with other picuters if
  there
  is an interest.
  C. Smith

  Sure send the pictures.
  Paul Lamar

  Here are some images. I didn't want to compress them too much, and
  loose all
  the detail.
  If there is a particular size you prefer to the group, please let me
  know.
  C. Smith

  Those are some strange marks but I don't see anything that is a show
  stopper.
  As long as the holes for the end seals are not too oversize you should be
  OK. The pict size is fine. Perhaps a few too many but OK for this once.

  Paul Lamar

Definitely seen better rotors.  I would question anything from the guy
with the hammer.

These appear to be 86-88 (8.5 CR) turbo rotors based on the rough cast
recess.  (pic#1)
To confirm, you will need to check the weight or the depth of the recess.
I have attached an old recess check for NA rotors, I don't have any
turbo stuff handy. (pic#2)

The rotors "might" be usable but you will want to spec them VERY carefully.
Check for Lynn Hannover's apex seal slot V wear.  He stands an apex seal
vertically out
of the apex seals slot.  It should have less than 3/16"? play.
Several of the corners appear to be slightly bent like in your pic#3 -
you will want to make
really sure that the corner seal (and other seals) moves freely.   The
corners are very flexible
and easily damaged.
You probably want to remove any of the ding that is proud or sticks out
from the surface. (pic#1)
Good used S5 rotors seem to go for about $75-100 apiece.
Cheers
Cary