Hi
All that's required is to have the axle flanges machined to allow the rotor "hat" to slip over (like a conventional hub).
I'm away until 20th July but I can let you know the required diameter to allow a snug fit to ensure rotor concentricity.
Unfortunately I think I have sold the remaining kits but I can see about producing a few more kits. Obviously the pricing can only be maintained if multiple kits are manufactured. Let me know....