i used some old futaba servos and a old ps2 case for the chassis. i forgot how glitchy those old servos are! they were really hard to control. i have 4 of these coming http://cgi.ebay.co.uk/ws/eBayISAPI.d...EOIBSA:GB:1123 and a one of these http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=370409998848.
all i should have to do is mod the chassis slightly so the servos are back to back, the wheels i am using were outside the chassis because of the larger servos, but with smaller servos they should be inside the chassis