CRAN,
"How do you get the DOC's down....well I could tell you, but then I would have to.."
OK, e-mail the answer. This way your cost is only one bullet.
In response to your request, the following is submitted for consideration.
It may be advantageous to have this future training craft as similar as possible to what future VTOL craft will be like. This raises the speculation as to whether the teetering rotor is part of the future, or will the future consist of hingeless hubs and tilt rotors etc.
With emphasis on the
'etc.' 
Dave