Sounds like the beginning of a plan. What condition is the rest of the gun? Is the damascus pattern crisp and well defined? The remaining bores clean and straight? The wood solid with acceptable dimensions? Are the engraving and screw heads still sharp and well defined? Trigger pulls and ejectors work satisfactorily? If the answers are "yes", IMHO, go for it, someone will surly be interested. 26" Diamond Quality 20 ga with Thin-walls would make a great shooter.
Cheers,
Jon