Sorry, in the spirit of Klipsch DIY, i'm only giving people ideas. I get the feeling that distributing detailed plans (free or for profit) might go against that.
That said, with a little work you can make your own plans
At higher frequencies yes.. but you can clearly see what is going on from photos on the net. (Which i have also more or less replicated in my design)
Plus the compression driver forms part of the throat anyway, and people are doing silly things like using long throat adaptors
This might give you guys some ideas on approximating a K402.. coming up with the drawings was a fairly small part of the whole project
https://www.stereo.net.au/forums/topic/232459-klipsch-k402-replica-build/