The African Flower Bag! (which saw here on ravelry)
I did my joining differently, choosing to have a visible ridge between blocks.
The side views.
I also chose to line mine, which the ravelry version wasn't.
I cut out the fabric to be roughly a centimetre wider than the crochet shape.
Then I pinned.
Then I clipped the inside corners.
Then I turned the lining under and stiched to the crochet with sewing thread (cotton). I made sure to stitch the lining underneath the top row of crochet, as that would need to be free to finish joining the bag.
Now it gets crocheted together to form sides.