Japer

Make sure in your mod folder the icon is located as follows;

media\ui\Traits\trait_yourtraitname.png

The image size for trait is 18x18 pixels

And

media\icons\Prof_yourprofname.png

The image size for Profession icons I used was 64x59 pixels

I figured it out, the correct code to make a weapon use the vanilla pistol ammo is as follows; 
 
 
ammoType = 'BerettaClip',clipName = 'Beretta Clip',clipIcon = 'BerettaClip',clipData = BerettaClip};

There are some wall textures within the map tools that when you place a window or a door on them, the wall will disappear, and it will also be like that in game

Current textures that do this are;
-location_restaurant_seahorse_01 2nd wall
-location_restaurant_spiffos_01 1st wall
-location_shed_01 1st and 2nd wall (2nd wall also fails to render NW corners)

Also;
location_restaurant_bar_01 1st wall there you can pass through in game

There are also a few shelving objects that you can pass through in game also