Cut out one rectangle for the back of the plushie according to the pattern, and two of each side pieces. We'll cut the front panel in a later step. If your fabric has a nap (soft in one direction and rough the opposite way), be sure to observe it and cut your pieces accordingly.

Use the black overlay template to cut a piece of black felt or other fuzzy fabric. Iron a piece of double-sided interfacing to the back of this piece and repin the pattern piece to the fabric.

Use a ruler and sharp blade to cut out the button windows. For curved corners, you can cut the straight portion of the lines with a knife and then finish off with a small pair of scissors. Felt doesn't fray and if you're using another fabric, the interfacing should help it not fray.

Before cutting the front panel, iron on the black "faceplate" piece, aligning the button windows with the conductive fabric buttons. This fabric insulates the thread traces from your hand (preventing unintended triggers) and also gives the controller that classic look.

I sandwiched in a piece of scrap fabric just big enough to cover the Flora board itself, just so it wouldn't get sticky in case I want to look at it or use it for another project.

make sure the USB port is aligned with the edge of this piece for easy connecting!

Use the front panel pattern piece (same as the back panel pattern piece) to cut off excess fabric around the circuit.

Pin the plushie side pieces together to form a rectangle, making sure the nap of the fabric all goes in the same direction (at this point it does not matter which direction, so long as there is consistency). Machine- or hand-stitch all four seams.

Lay your new rectangle out on top of the back of the plushie, and align and pin the edges, right sides together. If your fabric is especially fluffy with a strong nap, make sure the soft direction goes toward the seams you are about to sew. This will ensure that when the toy is finished, the fur will look and feel nice to the touch in a downward direction.

Stitch all four edge seams with a machine or by hand, leaving a gap on one long edge for stuffing.

Align the bottom part of the plushie to the front piece and pin around the edges, being sure the nap on the back panel matches the nap on the front panel. Stitch around all four edges and trim stray threads.

Turn the fabric shell right side out and fill with fiber fill, starting with the corners. Use a long chopstick to stuff the filling into the corners and then fill the remaining portion with small bits of stuffing at a time until it is reasonably firm and not lumpy.

Use a ladder stitch to close up the seam, and your plush controller is complete!