Still haven't fitted them into the "grand-horizon-fictional-40k-adapted-universe" tm but I really want to paint them.
Tau allies is a neat idea. But my Tau fleet is already large. My Imperial Navy sits at 1500pts, but two unpainted cruisers left. And then the Zeus CL & Zeus CA also flyin around. The Zeus CL will most likely end up in my Rogue Trader fleet collection, just like the Imperial cruiser + zeus prow. The new zeus cruiser will end up up as a reserve attachment to my Imperial fleet.
Perhaps the new Helios Battlegroup ends up as a new sector which has been cut of from the Imperium for ages (yet somehow having an own Mechanicus with ship templates), waging their own wars and now the vessel is being re-connected with the rest.
hmm, perhaps a new worm hole within the Koronus Expanse?