This may sound like a weird idea, but I have recently been offered some Oak railway sleepers, which have been kept inside for many years after they were removed and the wood looks gorgeous! I have been told the janka hardness is between 1260-1360. I could easily have enough wood to make a Shamisen (hey perhaps 2 or 3!) but I have never heard of a Shamisen made from Oak.
Should I give it a try?