What is this?

Hey guys, I'm trying to figure out what this thing is. It has a four spoke magnesium wheel on it. Any help will be appreciated!

The wheels look like the original C.T.Alloy's from Hayward , Ca....doesn't help to I.D. the kart though...a Margay is a good guess, unless it's a Bug.
The thing that puts me off is the back bumper. All the Margays and bugs I've seen have a rear bumper that was formed into the frame. And how hard would it be to find one more of those C.T alloys?
The bumper is strange, other than that it sure reminds me of an early Margay "Sidewinder"....... looks like you're missing a front wheel?.....I can look around my small stash. Frank