Once the felt had been made, and was mostly dry, I cut out a large circle.  Using my teapot, I carefully steamed the center of the circle until it was too hot to touch and then stretched it over the hat form, pulling it evenly on all sides.  Then, since I did not purchase a brim-form, I had to improvise.

Cotton muslin, wrapped around the band line created the form, and the pins molded the brim upward a bit. 

The finished product is not totally unpleasing, but it is definitely not an unqualified success.  The teapot did not do an adequate job steaming the felt, and it turns out that I made the felt out of too many layers and did not work it enough to generate a tight enough felt.  I might be able to make something quirky by adding some embroidery and trim.

A week or so after finishing this, I needed to order some millinery wire to repair one of my husbands hats.  Not having enough to meet their minimum order, I added a professionally made hat blank to the order.  Here you can see the difference in the felt tightness, though I think the finnsheep wool has a much finer luster.

And here you can see the difference in the thickness of the felt.  I think next time I will use only two layer of wool in making the felt.

So now I need to figure out what I want to do with the new blank…