Here are my take on Khurasan's Soriog & Alternate Armies Yndrassi.
Still a WIP.
I'm using the Yndrassi as the smaller,kin & the Soriogs as the larger ones.
Both are great mini ranges and can easily be used as 18mm Tau.
I have posted an update below. Here is a converted still a wip GW Tau piranha which is a great