Alan,
I remember when Hans posted that photo, the fly, recipe and SBS. Fantastic then and now! If by 'cat fur' we are to take it that he took it(the fur) from that 'lil purdy cat', then that fly is a one-and-done pattern, LOL. Ain't anybody going to get that material again(tongue n cheek).
Now, back to vise - Won't make anyone a better tyer but hey, there's a niche for almost everything. It's a beautiful vise.
Allan