Gitrdun, is the Chiappa a m92 clone or something else? I ask because I know boyd's sells full length stocks that require only basic fitting for a 92. They supposedly work on a ranch hand. Just a thought, get one of them, cut it to fit the mare's leg configuration and have the extension (now stained to match with matching wood grain) set up to thread on like two halves of a pool que. Only problem would be matching the stain to the forend.
I just thought of this - might have go ahead and order on of those full length stocks 'cause what I got is honestly butt-ugly.
Colin