Again, a bunch of pics in our own gallery as well!
Red Bull's RB14 has a similarly small airbox, and coincidentally is using the same Renault engine.
Halo blends in very well with the livery, I agree.
I thought every team would do it because of the obvious advantages, so it's surprising that Renault haven't. I doubt it's a budgetary thing because even Sauber have managed it.