And here is the back and main panel sewn back together. In this case, the bottom was part of the back, and the sides are part of the front. I didn't take any pictures but what you do is line up the edges, with the pieces placed "outside to outside", meaning the outsides are placed together (with the insides showing), and clamped/pinned together. I use small document clamps and quilting pins to hold everything together until sewn down. The first pass is approx. 1/4" from the edge, just to stitch everything in place. Once you are satisfied, then the seams are taped. In this case I use 1" binding tape. Since the build ups can get thick, it works the best. And since these pieces interlock, like a puzzle, you can run a continuous piece of binding tape down one side, around the bottom, and up the other side. I use a double row of stitching on the tape, so each seam is at least triple stitched. Since you are still working "inside out" , you then turn it outside and check seams.