250 Water Mill

So I wanted to make a good or at least mechanically passable mill map. This is a water mill. I'm by no means an expert in mechanical systems but I wanted the machinery in this map to make sense. So I researched a little on how actually mills work and went for a two-stepped milling process with this one.  It's supposed to more or less be feasible.

I'm of course open to criticism from people who actually know how this things work!