Yes it will work and if done properly you won't be able to tell that it's not all wood, only downside, if it is a problem to you, is that it will make the stock VERY heavy. Too much filler at one end of the stock will really effect the guns balance. Which can be a good thing if you want to change a guns natural point of balance to suit yourself.
I made this one to fit my 97K out of an old 77 stock.