The scorpion uses 18 bands and the equivalent band draw length of an Srv-1 in something the size of the Zip 3 (the scorpion is about 32.5 inches long) to shoot 200 ft +!
Not much to say besides the bands run from the bow underneath the barrel until about the trigger.
Preview video link: http://youtu.be/z8IDrWuGtLc
I may not finish this for at least a week so be patient!
Instructions are planned!