I would plan to run the pipe the length of the pond.. or make a loop. It would all have a slight pitch to it as well.
It is going to be about 8x4 so i am hoping to stay on top of weed invaders... though even the small clover that had gotten into my mini bog has been incredible hard to eradicate!
joe- I definitely am going to cover the whole bottom with the mesh to increase the drainage area.
It seems like a lot of people have threads of overwintering plants in zone 6... but not many follow ups the following year as to how their plans panned out for them. I must continue the hunt!