TT - your T67 question
With apologies as this won't be totally acurate, but it's about right:
The USAF bought a load (more than 50, I think) of T67s for use as basic trainers / ability assessment a/c (they had some fancy phrase for the latter which I forget), about five or so years ago.
However they had problems with engine reliability, and alhough instructors could not identify specific faults (e.g. they tested them by doing power off descents to land from 10k, and then immediately going to full power on the ground, and they behaved flawlessly), they eventually got fed up with them and grounded the lot.
An acquaintance of mine, aero display pilot, flew one and had nothing but praise for it BTW. Don't know about roll rate with that wingspan though.
Best of luck with it.