Steve- here are a few pics of hand-made forends an old friend of mine made probably 20 years ago. He lived in Ohio and loved to sit out in hayfields waiting for chucks to appear. One of his favorites was a Contender and with a portable bench, and sandbags, he was effective. For that use, he wanted a fuller forestock-not finding what he wanted, he made some. The pics show (1)a roughed out stock (2)semi-finished and (3) a finished copy I used for a 14". I never used it on a carbine barrel but I believe the two-hole spacing is the same for the carbine forend I have. I have since sold my pistol barrels but I may get another.
https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/galleries/13979607/tc