Back in the 70's, I knew a guy that built his bike in his dorm room. Probably done by many others back then, but this guy had a 4th floor room.

He spent over a year on it and only let a few people know what was going on. When he was finished, he had to sneak it out (RA was a real D!ck). The springer was long enough that he couldn't work it down the stairs. He ended up taking out the 4th floor window and easing it down into the courtyard with ropes (and half the dorm).