Soup

You don't have to do this in the same order I did, and there are probably way better ways to do it, but this is vaguely how it went for me as I bullshitted my way through. I did a mix of machine sewing and hand sewing.

(Red lines indicate where to sew, please account for seam allowance.)

The radiator piece on top is just a smaller version of the carapace top pattern (hence why I didn't make it its own pattern) and the actual "vents" themselves are just lines of that 11 stitch on my sewing machine. There's a bunch of different ways you can emulate the vents, but if you have a sewing machine this is the easiest way I figured to do it.

Sew that onto the centre of the carapace piece. I also put a small stitch connecting it at the very middle to keep it centred.

Sew all the sides to the top. If you want to have the clean edges/seams, then make sure to sew the fabric like sides to like sides.

Then sew all the sides to the sides except one so he's vaguely shaped (and inside-out.)

Flip him upside down and sew the sides to the bottom carapace piece, except for one near the two sides that are still open.

Then sew those remaining side pieces together (keep the bottom open), and flip him right-side-in through the open hole at the bottom so the preferred side of the fabric is on the outside and the seams are hidden inside. You can stuff him now and sew up the bottom panel if you want, or you can do it after the arms are attached.

The arms are pretty simple, just fold the rectangle in half (on the blue line), sew up the open side and one end to make a tube, flip it right-side-in the so the seams are hidden, stuff it, and sew up the remaining open end. Do that 5 times.

For the hands, sew three finger panels to the three small edges of the hand panel. Do that 10 times.

Take 2 hands pieces and sew them together, leaving the side that will attach to the arm open. Flip it inside out, stuff it, and then sew up that final side. Do that 5 times.

Sew all 5 hands to all 5 arms.

And then sew the arms to the carapace! (And stuff the carapace and sew up that last hole if you didn't earlier.)

Book Rocky plush!

Again, I completely fenagled mine and if I had followed my patterns perfectly to a tee it probably would look very different. There's definitely different and better ways to do this, especially depending on what materials and tools you're using.