This forum contains threads to discuss teams themselves. Anything not technical about the cars, including restructuring, performances etc belongs here.
Brake ducts are the same as FIA's
The only thing I can tell for sure isn't from the FIA's model is the engine cover and sidepods. Perhaps after RBR received all that backlash they just decided to stick some of their own bits to the standard model and call it their car.
I really don't think they'll have the lowest FW element attached to the nose unlike the other teams so far.