You know, I live out in the Boonies and get away with riding down the highway with mine, but over the Summer I met a guy who built one of these bikes and supposedly, according to him, Michigan law states that a motorized bike must have a sticker on it, like an ORV sticker.
Anyhow, he wanted to make his legal, so he had to put a headlight, taillight, blinkers, and a brake light on it. So at least there is a fix for your bike, IF you wanted to go "legal."
I, on the other hand, will continue to ride down the center of the highway when no cars are present, because.......that's what I do! I've had many different cops, state and local, pass me when I'm going down the road at full throttle and have yet to be pulled over.
IF you have to go legal, putting that stuff on your bike shouldn't be that big of a deal, if you can do a little jimmy-rigging.