You know there are 3 examples of this technology already. The Cardassian Dreadnought from VOY, the Cardassian defense grid from DS9, and the Federation Automated Transport from TOS/TAS.
One thing to keep in mind, in two of the cases above there was some lifeform friendly systems activated during maintenance periods. (Life support, Gravity, etc)
Also, do you really want your Automated Killing Machine to ever be out of contact, keep the Emergency Communications.
Other then that I like.
Phoenix...
"I'm not saying there should be capital punishment for stupidity,
but maybe we should just remove all the safety lables and let nature take it's course"
"A Place For Everything & Nothing In It's Place"