All the textures are tiled and do not use unique UV shells. You cannot use a baked ambient OCC map in this case, but it is still possible to use baked vertex color shadows on the asset.
You can use our blend shader for 3ds Max not just for previewing the result but also to paint your vertex alpha in real time.
Open up the Material Editor and switch the standard material to a DirectX shader where you can load the blend layer shader instead and get all the similar parameters of the sandbox editor to tweak the values.
Material Setup in CRYENGINE for Blend Mapping