http://cgi.ebay.co.uk/4-x-Battery-Powered-Coin-Operated-Orbiter-Cars-as-LOT_W0QQitemZ160220059009QQihZ006QQhttp://cgi.ebay.co.uk/4-x-Battery-Po...rs-as-LOT_W0QQ itemZ160220059009QQihZ006QQ

Buy them and hack them up, Human Wars just add a procective cage and a lifter weapon of some sort.