SD audio files, AFX (which make the SD files work) and Leatherface skin are all in the following link. Make sure to read the INSTRUCTIONS.txt, download and install them to get full experience of the mission.
http://www.mediafire.com/file/v5xdbpg6yckep1f/HL_SD%252C_AFX%252C_Skin.rar/file
Once again, Malvin (aka the veteran soldier) is sent in the woods of San Andreas to confront a difficult myth. Leatherface kills victims in The Panopticon without mercy with his chainsaw, and he's dangerous to the player too. Because Leatherface is a bullet proof myth, the soldier has to build his own plan to kill him and end this misery once and for all.
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Fun fact: This mission has 100 objectives.