The Chameleon Skink Stalker (or Oxyotl as we call him) still has rules, so he is still viable for open play and narrative play, but he has no point value anymore since the General's Handbook 2017 (IIRC) so he isn't usable in matched play. He also lacks the Seraphon keyword.
Anyway, here is my conversion. Very simple from a regular Skink.
I basically added the round eyes, sawed off the crest and tail and sculpted my own instead.
Not the best looking miniature, since I really suck at sculpting. But it gets the point across I think.
In the background you can see my Chameleon Skinks which were created in the same manner, just that those are green and the crests are a bit smaller.
Fun fact: I finished this conversion only days before he became unplayable in matched play. I was furious.