Structure
I imagine techfolk to have metal skeletons that look vaguely like ours, serving as anchor for their cabled 'muscles'. On top of that they have a framework to support their plating. Inside the body, the mechanical components are kept inside tyvek-like membranes to stop them snagging on cables. In addition, the spinal column is in the centre of the body for stability, instead of being at the back.
Techfolk don't really have a brain as such - there's no one object you can point to inside them and say 'that's its brain'. Their intelligence/consciousness is kinda a gestalt entity that materialises from their parts. And you can replace the parts Ship of Theseus style and their memories persist. (But you can't duplicate a techfolk by taking out half their parts and putting them into a new frame, because that would be silly.)
To use a silly comparison: it's a bit like Mr Potato Head as depicted in Toy Story. His parts are detachable and interchangeable, so you might think his consciousness is in the plastic potato. But he also puts his parts into a burrito or something (I forget what) and that's still him. His consciousness is manifested by an assembly of parts.
Or: which part of a computer is the 'brain'? The motherboard, the CPU, the hard drives? It's all of it, innit.