Multiple textures to a single mesh? (planar mapping + channels?)

how would you apply different textures (images) to the different sides of a cube mesh?

my approaches so far:

  1. box mapping = 1 texture appears on all sides
  2. 6 planar mapping, in 6 channels = I can’t (or I don’t know how to) apply different texture (or material) to each channel
  3. use labels = not working because hierarchy of labels, (first ones cover the later ones)

constrains: I can’t split the mesh into separated parts (because it is a complex mesh)

use divided option for cube mapping, and prepare your texture in PS accordingly.

It is quite well explained in the manual, but a bit tricky to wrap your head around at first.

*not sure if the mac version has that feature