I bought my son one of those cheapy china ones last Christmas. My 200lb brother rides the thing up and down the street no problem. You would have to fab up your own roll cage - but for something to ride around on, it can't be beat.
Not really for off-road though - one wheel drive and one-wheel disc brake.
With his little 70lb body on it, he can get the thing sideways under full throttle...
When i fab up an Limited slip - ill let you know....
His is like this one - but silver.
http://cgi.ebay.com/ebaymotors/New-...itemZ4581671337QQcategoryZ90986QQcmdZViewItem