Nice, clean rig. A more common method is to use PVC (or ABS, maybe) pipe. Way cheaper and easier to join. (Use primer!) I'd be worried about a blowout at a sweated copper joint, but that's just the way I solder! 
Plastic pipe does necessitate running a ground wire inside to get rid of static electricity build-up.
Again, nice job.
Bruno
Plastic pipe does necessitate running a ground wire inside to get rid of static electricity build-up.
Again, nice job.
Bruno