Hi, yes it is very hard on your upper body when you are learning. You wear a cuff velcroed to each wrist called "Kite Killers" and they connect to the brake lines with a 400mm bungee cord. When it all goes wrong, just drop the handles and this applies the brakes only and the kite depowers and falls to the ground. Most times not even tangling the lines.
In the photo you can see a small pulley that the strop (line connecting handles) is running through to each power line on the kite (it's connected to the back of the handle as the lines go right through).
The pulley is attached to a "Whichard quick release" on a climbing harness, so if in trouble, DUMP the kite handles and all with a pull of the release tag. This results in much untangling as it blows away.
I now have an "Ozone" harness that is more padded and comfortable. It spreads the load to your upper legs and waist. Very little load on your wrists. They fly very much like a Rev.
Yes I built the "Chook Chaser" my self, as I have a good workshop with Mig welder, lathe, mill, plasma cutter and pipe bender. (My wife reckons I live in there).
Here are some links.
I got to 76.4 Kmh yesterday on a salt lake 2 kms from home. Had 15mm of rain last night so won't be back there for a while now.
http://popeyethewelder.piczo.com/?g=1&cr=7 This guy is a star!!!!
http://www.powerkiteforum.com/forumdisplay.php?fid=7
http://www.extremekites.com.au/forums/viewtopic.php?f=17&t=12517
http://www.extremekites.com.au/forums/viewtopic.php?f=17&t=12978