Looks like it could easily be made by someone with proper equipment, laser cutting et al ..
Maizey's for the desired thickness poly carbonate and an aluminium offcut or two.
At least it doesn't go towards drugs. And after all is said and done, you rock up at the 1000 Bike Show in July with a good product. Up to you if it's going to be 2024 or 25.
Speaking of, be reminded of the Potch Bike Show on Sat 15 June.
The way I have it is that you stick a rod through the axle hole, centre it with an aluminium cone on both sides, and wait for it to settle. (The rod obviously rests on rollers on both sides on a stand). Then a weight gets stuck (with Prestik) on the upper side, and turn it through 90 degrees...
In a few months my bro will visit from NZ, and we will travel quite a lot. I have enough gear for both of us, except for a rain suit. Maybe you have one somewhere that is for sale? I'd have to see about the size, but let's start with average. Not Peter Dinklage or Faf de Klerk, nor Eben Etsebeth...