Interesting take on the timeline:
Sept. 14, 2015: Ahmed Mohamed, 14, is arrested and suspended from MacArthur High School in Irving after bringing an alarm clock to school that was mistaken for a bomb.
What he brought into the school wasn't exactly "an alarm clock." It was the inner circuitry from a cheap, digital alarm clock, removed from the clock and installed crudely into some kind of case (the details escape me at this late date), causing a teacher who saw it to think that it might be a bomb. There were plenty of photos of the device in the media at the time. While I might or might not have thought it was a bomb, I would NOT have thought it was an alarm clock.
And, to paraphrase our former chief executive, "[He] didn't build that." He just ripped it out of one enclosure and stuck it into a different enclosure.