Congratulations on being the very first one that created and shares a skin using Chameleon DNA!
Nice work. Now I will have to buy an OLED monitor ;-)
I don't fully agree that the dividing borders in the header bar aren't vital.
Most users will probably want to see where they can drag to resize the widths of the columns.
Experienced MB users may be able to find it by hovering their mouse over it, but I think that won't work with a touchpad?
If you do want to make it completely invisible you can use a little trick, which is adding transparency to the element:
Edit: Content[TrackDetail].Body.ListHeader" bdr="0,0,0,0"