It could be done, but there have been a few versions made over the years with a factroy 16" barrel. Finding one of those will simplify your project considerably.
They currently offer a Spikehorn version as a youth gun. It comes with a 16" barrel and cheap wood cut down to a shorter LOP. It is not hard to find a full size replcement stock. Several options for better sights.
They made a straight stoked version with short barrel back in the 50's, 60's called the Maurader. They turn up from time to time. I have an LTS version from 1988 with the same short barrel. Basically a newer version of the Maurader.
http://www.budsgunshop.com/catalog/p...ducts_id/72758
http://www.gunlistings.org/californi...arauder__rare_
http://www.gunsamerica.com/992114087...in_LTS_336.htm