Anyone know where I can get an old/used/skinless tsugaru dou?

Title speaks for itself.

I want to try experimenting with how I can alter the sound by making a fully wooden dou like that of a gottan, but with gaps for sound like a typical lute.

Before having to making one myself, I wanted to see if I could find one online or if anyone has a dou to spare.

Thanks!

Hello.
You could search on buyee.jp