@edwardaneal, until 2014, a T-rex would be a home built bike on the title here, may be different in other states. Then the state came up with auto cycle when the slingshot was made.
yea, there are all kinds of different rules in different states - from what I understand if you want an Areial Atom in California you have to jump through all kinds of kit/experimental car hoops and its a real pain, but then again I did see a lotus 340R in a parking Garage in down town Palm Springs that had plates on it and those things are not even supposed to be street legal - - as a side note it was very cool kind a like a quad slingshot