Concept: Excavator

This excavator would have two motors in the bottom for moving each track independently, one motor for moving the arm up and down, and one motor for controlling what is at the end of the arm. The excavator would have four different attachments on the end which would be a bucket, a drill, a claw, and a shooter. The hub would be in the back providing a counterweight.
Image attached to challenge
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LEGO® MINDSTORMS® Robot Inventor

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