code: function(){
      var frameData = this.croppedFrameData(),
        packedFrames = [],
        frameDatum;
  
      packedFrames.push(this.packingStructure);
  
      for (var i = 0, len = frameData.length; i < len; i++){
        frameDatum = frameData[i];
  
        packedFrames.push(
          this.packArray(
            this.packingStructure,
            frameDatum
          )
        );
  
      }
  
      return packedFrames;
    }
docs: returns an array the first item is the keys of the following items nested arrays are expected to have idententical siblings