Andy,
Sounds ambitious, especially in MN. I think TJJ’s comments are harsh but right on the money. Long horizontal run will may freeze in spring and become nice ice sculpture after the pipe bursts with freeze thaw(electrical heat tape maybe). I am curious about plant species as well. I applaud people who go out the edge in our lovely climate ( right now it is -8 F) but this better be a demo project or an exploration to see what if.
Good Luck