The two biggest furniture companies in Takayama are Kashiwa Co. and Hida Sangyo Co. They are both very established in Japan and have long histories in the traditional and more recently, highly modern, furniture design industry. My ceramic sensei, Dai, accompanied me to visit the showrooms and factories of these two big companies. He is friends with some of the members of the companies so getting a behind-the-scenes look at the inner-workings was possible!
Hida Sangyo sells scrap wood outside their showroom. It's really cheap and perfectly usable- I might swing by and pick some up soon!