This looks really cool. Its a shame it doesn't seem to be up to date anymore. The framework is here, however, to write a up-to-date version of the plugin for Unity. Its on my 'ToDoWhenImNotSoBusyWithCollege" List.
Orginal Readme.md:
Plugin to import resources from the Source engine in Unity3D.
Author(Me): vk.com/lewa_j
VK Public: vk.com/uSrcTools
Suported formats:
bsp - maps
vmt - materials
vtf - textures
mdl - models
vvd - models vertices
vtx - model indices
============================================== uSource UnitySourceTools uSrcTools