This is a center vent I built for my truck's AC. There's two stock plastic AC vents mounted onto an aluminum piece that fits in the dash.
Here's the aluminum panel that holds the vents-
The assembly ready to go into the dash-
I glued some steel rod on the grill so I could improve airflow a little bit
In the end, I didn't use it. Old Air had one that also had the AC controls that poked through the grill - I likeed the look of it so I bought theirs