Buff Box & SD Buff Box
 

There any way I can remove the border around ONLY these 2 windows?

You can remove any border you want. Using a buffwindow as an example:

<Screen item="BuffWindow">
<!--<ScreenID/>-->
<Text>Buffs</Text>
<RelativePosition>false</RelativePosition>
<Location>
<X>0</X>
<Y>20</Y>
</Location>
<Size>
<CX>585</CX>
<CY>77</CY>
</Size>
<Style_Transparent>true</Style_Transparent>
<DrawTemplate>WDT_RoundedNoSides</DrawTemplate>
<Style_Titlebar>false</Style_Titlebar>
<Style_Closebox>false</Style_Closebox>
<Style_Minimizebox>false</Style_Minimizebox>
<Style_Border>true</Style_Border>

Make sure that line is set to false. No border.