y00tz, no offense, but, that unwrap is absolutely hideous.
It should be WAY WAY cleaner and more organized than that.
All your parts should be logically connected and laid out better.
Although that unwrap may pass the checkerboard test, it certainly would not be acceptable for production use at all.
I don't know blender at all (I use 3D Studio Max).
Here's a tutorial I wrote on unwrapping a while ago. It's done in MAX, but you should be able to figure out some methodologies from it.
http://www.logictechnologies.com/keith/tutorial/unwrap/uvunwrap.htmKeep in mind the "one complete attached mesh" idea I talk about is false. But the unwrapping actions still hold true.