High G, F# and F whistles are now available.
All tubes have been re-calculated for optimal finger spacing and better cross-fingering of the flattened 7th.
The limitations of thin-walled tubes prevent me from making them cross-finger perfectly, but OXXXOX is now decent on all my tubes.
My just temperament tubes now have an almost identical hole spacing compared to my equal temperament tubes, though the hole sizes are now a bit different.
Additional left and/or right thumb and/or pinkie holes are now optional on all tubes, which means 10-hole whistles are now available if you’re feeling particularly adventurous! 
Aluminum tubes are currently in the prototype stage, and will hopefully be available soon.
That’s it for now, but stay tuned for further developments!