I did a Model A visor thread previously and figured there was a lot of cross over between A & T's so how about a look at what folks are doing for visors on their model T closed car builds. Mine looks like this;
Stock T Coupe/Sedan and 28-29 A Pickup visors are a sheet metal frame covered with short/long grain top material. Try louvering that!
We do need some good ideas so that we can get away from the original covered visors. They might have worked OK at 20mph but not at todays highway speeds.
Here is a pic of my 26 I have a 30/31 model A visor that has been narrowed and then attacked by the hole saw!!! Here is another pic, without the top