The phenotype replacement models are using the Beamdog HD Pack assets as a base. This page should be populated with a list of assets from that pack at some stage plus any additions to the phenotype models in general marked as such.
This generally includes:
The main phenotypes contain one erroenous error; the left hand model for weapons isn't properly flipped - if you have a guard say around the fingers, it will go through the hand in odd ways the other side. Bioware had made all weapons basically withhout any guards or single-side areas that'd go wonky.
This is an opportunity to properly fix this on all the base phenotype node placements.
There is potential to actually do the "thin" phenotype as part of the work; NWN Armoury probably can sort this out reasonably easily and it can be duplicated for the horse phenotypes too.
Others would make available further animations. Stealthy or different combat styles perhaps.