There is a quote of him saying that the Mahri masks are the standard shape of those masks and seeing that this is the case for both the Faxon with Lesovikk and the Volitak with Nidhiki its very reasonable to assume the rest are standard shapes as well.
Further more Greg has also said that the Inika masks are the same both organic and non organic. The only reason this wasn’t exactly enforced in the Hagah contest is because they wanted to allow for more freedom with builds.
If someone knows where to find the response to the Volitak’s shape from before the Hagah contest began please let me know. Can’t recall if it was Eljay or Meso who posted it.
Edit: nvm found it Toa Hagah Canon Contest Survey and Final Q&A - #371 by Mesonak