At this point the biochemists have managed to create amino acid based structures that are stronger than the vast majority of building materials. Surely enhanced organic parts is the way to go?
I see no reason to expect that superwood is incompatible with in place biological synthesis from scratch. That's entirely organic and there's no question that its material properties far exceed those of our OEM specifications.
I often like to point out--satisfying a contrarian streak--that our original human equipment is literally the most mind-bogglingly complicated nanotechnology beyond our understanding, packed with dozens of incredible features we cannot imitate with circuits or chrome.
So as much as I like the aesthetics of cyberpunk metal arms, keeping our OEM parts is better. If we need metal bodies at a construction site, let them be remote-controlled bodies that stay there for the next shift to use.