heater delete general questions

Hi y'all

I am looking at making a stock looking heater delete for my 67 barracuda. Making the firewall plates is easy, but i have some questions.

On heater delete cars are there still plastic defroster vents in the dash, or are there flat covers? What is done with the cowl vent hole on the passenger side? Is a cover installed, or is there another fresh air vent setup with a door kind of an opposite looking of the drivers side vent?

I know there prob wasnt a heater delete option on the 67 barracuda like there was on dodge darts, however i want it to look somewhat stock, as if the factory did one to this car. I have come up with a cover design for the heater control in the dash to cover it up similar to a radio delete plate.

Anybody have a heater delete car who can answer these questions, or maybe some of these pieces from one they are qilling to sell?

Thanks in advance.
Matt