Lord High Munchkin said:Yes, but is it self-replicating power-armour, nano-swarm fog?
It's not that weird (heck I can certainly envision it)... so by c. TL12 it should certainly be possible.
Are not "fog" and "armor" mutually exclusive by definition. One is VERY solid and one is VERY insubstantial.
... what about a nano-swarm gel or paste or crystal matrix?
Each individual nano-machine will do one thing very well, but you seem to imply that each nano-machine will do whatever you want it to. Your description implies a definition of nano-machines that violates basic thermodynamics and biomechanics. Each nannite is a tiny tool, not a tiny worker ... specialized rather than general purpose.
It will require one heck of a technology breakthrough to physically shrink the size of an atom to build more complex molecules in less space.
YMMV