Hey everybody. I am Natalie's husband and helping with the build.
In response to the copper, we wanted to use it for the structure as well so the plastic tubing wouldn't do any good. We are thinking about scratching the copper and using something else, maybe conduit with a tube on the inside of it for the water to run through and then a coating on the outside of the metal to cover it and protect it. We are very thankful for all the ideas you guys are giving us.