Here is an early Alyx model like in first HL2 trailer.
Fully works on HL2, Ep1 and Ep2.

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Installation: 

1) create a new folder in the game directory and call it "custom"
(e.g. Steam\steamapps\common\Half-Life 2\hl2\custom\);

2) Put .vpk files from this archive to the "custom" folder;

3) Play.

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Troubleshooting: 

If you did everything right, but you cannot see any changes in game:

1) Check folder paths again;

2) Check gameinfo.txt file, which you can find at main folder (e.g. Steam\steamapps\common\Half-Life 2\hl2\gameinfo.txt)
Open this file and after the "SteamAppId" string you should see this:				 

		SearchPaths
		{
			// First, mount all user customizations.  This will search for VPKs and subfolders
			// and mount them in alphabetical order.  The easiest way to distribute a mod is to
			// pack up the custom content into a VPK.  To "install" a mod, just drop it in this
			// folder.
			//
			// Note that this folder is scanned only when the game is booted.
			game+mod			hl2/custom/*

			// We search VPK files before ordinary folders, because most files will be found in
			// VPK and we can avoid making thousands of file system calls to attempt to open files
			// in folders where they don't exist.  (Searching a VPK is much faster than making an operating
			// system call.)
			game_lv				hl2/hl2_lv.vpk

If you dont see "game+mod hl2/custom/*" string right after "SearchPaths", just add it.

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Credits:

T-braze - mesh preparation, rigging, compiling
OddDoc - texture fixing

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Links:

http://hl2-beta.ru

http://vk.com/beta_project

http://combineoverwiki.net/wiki/Main_Page

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NOTE:

If you are going to use that addon in any other purposes except private use (modding, download mirroring etc.) then you must specify the authors.

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