Very interesting pattern Mr Tucker!
The second photo, I have to agree with William a little, it does kind of look a little like a "highway head-on"

but that might be a good thing. Does a trout see it as a Lil Dorothy swimming away- or a sulphur heading toward it?
I would sure be fishing it to see if the head of the fly acts as a trigger, could be just the kind of variation to make a good pattern great on a slack day. It may even be perceived as a dun shedding a nymphal shuck.......
Could the embroidery floss be separated out to give a working thread for the head area?
The confusion around the hook size is a classic East meets West scenario, (like you doing business in China?). What seems odd sizing to us, will be very familiar to a Japanese Tenkara tier. Wee bit like the "new" hook size scale that never really caught on, leads to a bit of confusion when referring to old tying books like Taverner's Fly Tying for Trout.

.