Had fun with this for a couple minutes. Would definitely be cool to see what this becomes.<p>A couple things I noticed:<p>Underlining and placing the description of the command on the same line as the command made me totally glance over the actual command. I typed "Make box" two or three times before I saw there was an example, and then finally I saw the syntax.<p>Another nice thing would be if there were some defaults, especially for the initial x/y values.<p>A question would be, how exactly are joints supposed to work? Sometimes they seem very rigid, other times it almost <i>bends</i>.