Models + Weapons

How would I transfer models or weapons from a from a game, say like Skyrim Weapons/Models to GMod.

By extracting the models from the game by any possible means, converting them to somthing that you can import into 3DS Max, Maya or Blender, fix them if needed ( holes, textures, fucked up vertices, etc )
export into .smd or valve .dmx, write a .qc, compile the .qc, test in gmod, code the weapons with Lua.

And the same for textures basically.

Okay, thank you very much!