Alex, I'm late to this party, but I LOVE the split base concept! I'm really looking forward to seeing how this all comes out.
My only comment concerns the log. All the bases have what I call a "hard edge" - the groundwork goes right to the edge of the base, and shapes and guides the eye to the key elements of the scene. I personally like a hard edge, and use it constantly. But the log overlaps the hard edge, and gets me wondering why there's nothing under it, and diverts my attention. Now maybe it's just me, but if the log was also cut flush with the base side (and painted flat black), it would still convey the forest setting, but would keep my focus on the figures, where it belongs.
On the other hand, if I'm in the minority on this one, this little niggle will NOT lessen my appreciation of what you are doing with this piece! Don