Zach Martini’s six-foot-seven-inch, two-hundred-thirty-five-pound frame is overwhelming a folding chair on the Princeton men’s basketball bench in Jadwin Gym. All around him is chaos, with television cameras, bouncing basketballs, reporters everywhere. The metal wheels of a cart add to the noise as it wheels in a giant cake, whose shape is modeled after the building itself. Everyone who wanders into the gym is offering congratulations, hugs, laughs. This is what it’s like when you reach the Sweet 16 of the NCAA tournament, like Martini and his Princeton basketball teammates have (the Tigers will face Creighton at 9 pm Friday night…