Nice! But I bet it still uses a comparable amount of steel to the reactor reactor (in the blades), and I don't think replacing steel with wood would impact the concrete usage either.
I think the blades are mostly fiberglass these days?
Glulam wood can substitute for some uses of concrete, but I'm thinking it's probably not ideal for earth contact applications. Especially in places like Ohio, which we mentioned as an example in https://news.ycombinator.com/item?id=22181187
