Hi,
Here is my draft of a 240z dash vent in Fusion 360 I did on the weekend. I had done this up in Rhino 5 but figure Fusion 360 is a bit more flexible. Just doing this for fun/learning but I do plan on getting the dimensions correct at some point.
I left off the bumps/grip to keep it nice and sleek.
I also did the central vent (with bumps).
Cheers
Scott