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You could always decompile a similar model to see how other people set up the rig.
In Blender: http://puu.sh/57w6e.jpg
In Importer: http://puu.sh/57x1n.jpg
Thanks for all the help so far. I will make sure I add you to the Valves service provider list whenever i get round to submitting as couldn't have done it without the videos you made :)
https://dl.dropboxusercontent.com/u/10100459/BlenderImages/clearMaterialandUV.jpg
Also thanks for listing me as a service provider! I really appreciate it ^_^