You can hide the following objects from every UI you're using, even the default Lotro UI. You just need to do some SkinDefinition.xml editing by yourself.
- xpbar
- autoattackbutton+the animation around it
- fervour meter
- hunter aim meter
- toolbars (quest,craft etc)
- bags
Just change the Width and Height values of those Elements you want to hide to 1
Code:
i.e.
<Element ID="ToolBarButton_Quest" X="330" Y="24" Width="1" Height="1" />
You can also hide many other objects by using a transparent .tga picture to hide those
ArtAssets you don't want to be shown.