I took the pieces with me to Sew Day on a whim and actually made some progress. Mary C helped me to measure my head to confirm I actually have a teen head. I do!
Once that was established, which I admit was holding me back from making progress, I decided to cut out the pieces and get them ready to sew.
I made one change. Instead of cutting out four pieces for the brim and sewing two together I left that piece whole. It will look like a donut. I did check the directions and think it will be fine – I think it will save me a couple of seams and keep the pattern of the fabric intact. I have plenty of fabric, so if it doesn’t work then I can do something else.
I forgot the interfacing I planned to use so that will be a project for another day.