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(2) is covered in fourth paragraph of Rope Bridge.
Edited by eroock
No it's not hyperspace arsenal. It's more something you see a lot in western cartoons and sometimes anime and it's specifically concerned with the relative size of something before and after transformations, or some small panel on a machine or robot sliding open to reveal something that couldn't fit through the hole, or better yet, through the machine in the first place.
Like in 'My life as a teenage robot', Jenny has an arm the size of a normal human but her arm can transform into a huge drill, saw or gun as big as she is and many times the size of her arm. Even more surprising is that she has dozens of weapons much larger than each arm—-how does all of that fit inside there?
Or in the anime Gurren Laggan where a drill can emerge from a robot that is many times larger than the robot itself.
Covered under Hammerspace I would say.
Sounds a bit like Bigger on the Inside meets Telescoping Robot.
~What trope could be described as devices, machinery, and robots that undergoes transformations in where something very large emerges from a small space or many devices are stored inside a small space, more than could conceivably fit. Like between "Hammerspace" and "Telescoping Robot".
~While I'm here, Is there a trope for that one rotten plank on every rope bridge ever that some character always steps on?