REQUEST: Side-by-side classic shotgun

Are there any good weapon paper model makers that would either have a plan already made, links to some, or any help to making one?

I've been trying to find one for Quite A While now and have been attemptin to create One by first modeling it out etc. but hit a "bit" of a setback with my computer frying up completely during a thunderstorm.

Looking Now for the classic type of shotgun. Attempting to acquire the level of detail and possible function that are akin to the "Paper Manufacturing" brands level of quality.