The sewing went well. Unfortunately, I could not find my funnel and ended up doing this:
which resulted in scenes like this:
Something tells me I will be finding grains of rice in my sewing room for some time to come.
This was made with two 9x13" pieces of fabric for the base. When I finished, I thought I had over-stuffed it because it was rigid, not forming to the neck. However, just bending and playing with it a bit made it softer so that it bent to the neck nicely. I don't know whether the flannel stretched out or the rice just needed to settle more. Either way, it turned out perfectly for me.