TA DA!
Sewing it together wasn't that tricky after all - a bit of finger pressing and it was pretty much there (that's what you get for using a mathematically designed template!)
But once it came to popping it right side out, I had to remove the stiff card as the stitching was so delicate (by my standards!) I didn't want to risk ripping the fabric ... so I was left with a deflated little ball ...
... Then came the stuffing ...
And here it is, in all its congruent, geometric perfection ... (well, actually, it's a bit soft and curvy!)
