LEGO 7670: Hailfire Droid & Spider Droid | Brickset: LEGO set guide and database
Lego Technic Hailfire Droid Robot, slightly modified from a MOC I saw on Youtube. Added the top frame to even out the roll and added some pins to the battery pack as
LEGO 4481 Technic Hailfire Droid Set Parts Inventory and Instructions - LEGO Reference Guide