i have finaly got my hands on a car battery to use for my power supply. which proves to be quite effeciant. my robot now wieghts around 80 lbs 50-60 of which is the car battery. however i'm finding my self having to put added support on the wheels after a 185lb...(how to put it politely...) idot sat on it. also i have designed a curicuit to have two hologen bulbs strobe back and forth and working on a pc board to mount them on the robot.