All well and good (about the secure door)..... but what happens if you want to take a crap, or when the cabin crew bring you in some tea or a meal ?
The door only needs only be open for a split second for any nutter to make a dash & grab for it, and then where are you ?!
Certainly on a B737 (which I fly) a 'hardened door' will only work if we cocoon ourselves in the cockpit for the duration of the flight, which is not (as yet, due to the overall aircraft flight-deck / galley design) practicable, i.e. the B737-NG's have a seriously long endurance (3500Nm's), one which is almost certainly longer than my bladders !
That said, I like the idea of the add-on video system, it'd certainly come in handy for checking out the top-totty
Ps. If we're gonna have shooters, make mine either a Browning 9mm (10 in the clip, plus 1 in the chamber) or a good'ole Colt45 (plus an extra clip please, as I might need more than 8 rounds - hope I don’t though), all with soft-nose / hollow-point ammo. Ta.