I think that there are ways to standardize organic components. One of the links provided in another comment to the south china morning post has a good write up

I think that there are ways to standardize organic components. One of the links provided in another comment to the south china morning post has a good write up on the scaffolding. They show the minimum thickness of the wood as well as the minimum diameter. We know that wood of specified dimensions have the necessary strength. Sure, these components might not be "straight", but as long as they have the minimum specs, they can be considered standardized. Hell, go to your local big box hardware store, either the blue one or orange one, and look at all of the non-straight standardized lumber they offer. People build houses out of that crap