Beautiful job on that bucket. I wish I had those skills.
The counterweight appears to be concrete that is not encased all around. I would have thought it would have cracked and not lived very long. If this is not the case. I may make one simply out of a plywood mold and cast in the necessary 3PH attachment points.
Love your counterweight. Is that your own design? Never seen one quite like it before. What does it weigh?