It it is all you can afford, yes.
Pillars embeded into the wood
They started using wood in 1923 with their first rifle, and still use wood today on some of the models.
Yes
The slender metal part of the rear of the frame that extends into the wood of the stock.
The stock and forearm were traditional wood, but can be other materials. With the AR15 and M16 rifle, they are made from metals and plastics.
Value of Rifle by Norinco SKS 7.62x39 with and without wood stock?
The stock is the part of a rifle or shotgun that you place against your shoulder. Usually made of wood or plastic, they can have different shapes.
I would look to 2 suppliers for your Mossberg stock.The first would be Numrich gun parts corp.the second would be Havlin sales.Both of these firms may be found on the web.
Sheets of different woods are coated with glue, pressed together, and when glue has set, wood is carved into a rifle stock. See the link below for pictures. Sometimes done for strength, sometimes for appearances.
Your rifle was made by Mossberg as their model 479. Values are typically 10% less than the parent gun, due to lesser finish, cheaper wood for stocks, etc.
Your first step is to go the library and check out books on wood working