You might want to switch to opaque tubing. Those clear lines will start getting funky real quick when you put it out in the sun. Or maybe ditch the tubes altogether; I think you'll get more evaporative cooling if you just top-water the moss. Looks good though, very clean rig as was said. I'm hoping to set up something like that to recirculate the water in all my outdoor trays - I'm sure it'll be big and clumsy though, and only a few will get the direct watering.