This small addon simply stretches the default target frame.
The default unit frames are more than adequate for many of us. Except maybe the target frame can be cramped at times. Very long names get cut off and with the new option to display health as both a percentage and numbers, the actual health bar gets lost behind the text.
This addon splits and re-anchors the target frame textures so it can be widened to any arbitrary width.
I've chosen 280 for a width as pictured to the right. If you're comfortable editing the lua you can choose your own width by editing the number at the top of the file. (This is a very small addon with no events registered and such, so I decided to forego in-game options to keep it in the spirit of bare necessity).