Im familiar with Siberia, but not the western theme, but I'll listen to it.
Great use of sampling, once again.
Nice build-up there at the start (starting to drag out, though )
This one is very flat too...
The part at about 3:20 is very nice. Good and full.
I would consider having more of the original melody in there, I could barely hear any of it (until about 3:10-20)