Me, N7BAN, with completed rebar cage. This took the better part of the day to build. The biggest challenge was keeping it vertical while building it. We opted to build it outside the hole because we thought it would be easier. We also did not add the center vertical pieces to save on weight. The cage for this tower is made from 16 #7 bar for the verticals and 20 #3 bar ties. Total cage weight is about 320 lbs.