Wow! That door is gutted! I guess I can make the decision to run a NACA duct vent window or not after I get the seat. I was planning to run the vent window for some airflow but getting out of a car on fire probably out weighs the need to keep cooler!
I haven't put any thought to moving the mirrors yet..
Definitely kill the triangle window. I'm as small as they come...and its tight getting out around the seat halo with a helmet, race suit, and HANS device on...that's just when you are calm in the driveway at home. You want every bit of room to GTFU when shits on fire and the door is jammed.
With a full suit and a helmet outside airflow doesn't make that much difference. There's plenty of airflow from the open windows, anway. Put the NACA in the passenger window and a hose pointing at you, if you want some air. Plan on a cool suit to stay cool, though.
I also deleted the "spike" you see in the picture of Alberto's window....the last remnant of "track" for the triangle window glass. I made a Lexan window to cover the space when trailered, or in the paddock overnight to keep most rain water out.