Board is just pegboard without holes. $8 for 4x8 sheet at Home Depot or Lowe’s.
I’m actually using plastic panel fasteners. Will drill large hole with small hole next to it (connecting holes). Fastener goes in large hole side then slides across to smaller side. Then will drill appropriate size hole in door for fastener to snap in to. No visible screw heads in carpeting.
I just carpeted one. Stapled plastic vent in first. Then covered vent with blue tape. Sprayed panel with spray glue then layed carpet. Cut out vent 1/4” smaller than vent all around. That extra 1/4” tucks into the side of the vent leaving a clean look.
Have to sleep for work tonight. But will be debating the chrome strip. I predrilled holes in backer board in case I do decide to put chrome trim on.