I am finishin a tenor Uke and I would like to add an ebony or similar wood pickguard , I think it would look cool but how it would affect to the sound it will damping it??
Better to go with a thin black plastic material.
PIckguards don't affect the tone if properly thin and on a uke, if they are contained above the lower transverse brace .
I've used thin wood pickguards on several instruments. No more than 1.5mm thick and kept in the upper bout to 1/2 way to the lower transverse brace. No affect on the sound at all.