This one is pretty subtle, because Alistair is the one recurring character whose model doesn't seem to have changed that much between Origins and Inquisition (we'll ignore the little wibble that is his DA:II model), though his colouring has. So this is more of a refinement than remodel.

There are two versions: 

Version i uses all base game content and will not require you to install any other mods. 

Version ii uses custom content and will require the following mods in order to show up correctly-
- LOTC's Eye Textures
- Pineappletree's Vibrant Colors
- SJC's Freckled Skin


My screenshots also use the following mods, but they are not required for the morph to work. They are, however, highly recommended!
- Eyebrow Presets
- White Teeth
- Grey Wardens of Ferelden

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Installation
Extract your chosen version of the mod and place the .mor file in your Dragon Age/Packages/Core/Override folder.
To uninstall simply delete the .mor file from the overrides folder.

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Bugs!
If you encounter a problem using this mod, please let me know and I'll try to figure it out and fix it. 
If you think I've missed a required mod from the list, also, please let me know and I'll update it.