Well it looks ok but then again some of those tags are quite old and they have been replaced by others. That might affect it's functionality - amongst other things
ToolbarField and ToolbarFieldMain basically defines the size of the the mainbar.
ToolbarField is the parent element that includes all the little gizmos inside the mainbar. If you wonder why Y="2000" that is there to make sure the bar stays at the bottom with any resolution therefore eliminating the need of edit that value if the resolution is changed.
ToolbarFieldMain is the the mainbar ArtAsset controller that controls the mainbar Targa (TGA) picture.
So by editing those two element's X, Y, Width and Height values should change the mainbar size and location.
If you're going with a full width mainbar then pick a resolution you're going to make the UI for - make mainbar Targa file for that specific resolution. Set same values for width and height with both of those elements as your picture has. Leave the X and Y values as they are in the above example.
LevelMeter is the parent element for the XP bar.