This is what a Unicorn track looks like. Screenshot from one of the vocal tracks above, zoomed out to project overview.

In general, layered beats at the top, you can tell they play the same. Then the bass, closely following the beats, then the general sounds making up melodic and harmonic stuff, then some FX. Vocals are the majority of the lower part.

I never start out in this system, or keep it during the build process. Everything is a mess during the creative phase.

During mixing I try to organize it the same way I approach the mix, from top to bottom. Also makes it easier to locate stuff when you know approx where to look for it.