Need the Valve Biped

As the title says I need to find out how to get the valve biped used on Gmod so I can use it to rig a mesh to it, any ideas/guides/tuts on how to do so would be most helpful, thanks.

I can’t use any old biped as it needs to be able to use the animations in gmod like walking or can any biped use the animations, not so sure and not too experienced in the matter.

Decompile any valve model