Or you could use an I-phone feeding its video back to a computer controller operating via the cellular system.
As for bomb load, that is indeed the kicker for off the shelf remote controlled aircraft.
A well designed small aircraft with a motorcycle engine could probably deliver 100-200 pounds of explosives, but it would also need larger, not off the shelf, control servos.
In a nutshell, not at all rocket science, but not a small project either.
“This undated photo released by the United States Attorney’s Office District of Massachusetts (USAMA), shows a remote controlled model of the US Navy’s 1960s Phantom jet fighter that allegedly belonged to Rezwan Ferdaus, who was arrested on charges of planning to fly explosive-packed, remote controlled airplanes into the Pentagon and the Capitol in Washington, authorities said. (AFP Photo/)”
A few pounds of Kaboomite in this one, maybe. He’d crack/puncture the exterior a bit, break a lot of windows, and piss off the guys in Humvees with .50s in the parking lot.