Turning the Panels into a Coherent Corset
Build each half of the corset as above until you reach the front-most panel (in this case, Panel 6).
If your corset will have a solid front, take one of your Panel 6 pieces and use it to join the two halves. Take the second Panel 6 piece and sew it to the body of the corset on only one side. Then attach the waist tape before sewing the other side of Panel 6 to the body of the corset.
If you are using my method to insert a busk, prepare the hook half of Panel 6 as per the busk tutorial. Then stitch only the front side Panel5-6 seams for both halves of the corset. Leave one seam on each half open (do not yet make the corset pieces a complete loop), so it will be easier to add the waist tape.
Clip your seams as needed.
Stitch all remaining seams so the corset body is a closed loop of fabric.