I was inspired by Moralrat's walker builds.
I had planned to make it look like a spider, however working with braces instead of wood or changing the shape made it too flexible to work. So I just put a repeater catapult in there.
I and K control the left legs. O and L control the right legs.
/ shoots the catapult.
Use 1,2,3 and 4 to load the second bomb.
Use 5,6,7 and 8 to load the third bomb.