I designed the first iteration of the King Cleveland 600 Trumpet adapter. I took the files from the Bach student trumpet and slightly modified the height and location of the holes for the tubes to extend out, based on a couple photos that were sent to me from a family that is interested in an adapter for their son. I'm going to send a test print to the family to see how it fits on the trumpet, and then make any necessary revisions.

Bach on left, King Cleveland on right.

UPDATE 11/14

Pictures on the King Cleveland 600 Trumpet