That wooden bike looks amazing! But I would be worried about the safety of a wooden fork. I myself have built two bamboo bike frames (one road, one mountain) and they work really well. There is
enough information on the internet for a doityourselfer to build one, but all builders advice against using bamboo for the front fork. One
sustainability drawback is that the joints are made using synthetic resins (epoxy most commonly) reinforced with either carbon fiber or any natural fiber (e.g. jute, sisal, fique, banana or that other plant that must not be named on permies). I do remember that one of the oldest US bamboo bike makers (calfee bikes) has made at least one frame using a natural resin, but the details were kept secret.