You won't find anyone who stocks parts since the company only operated from 1903 to 1913. But since most double barrel buttstocks are pretty similar, you could probably find one at a gun shop or gunshow that could be altered to fit. Same goes for trigger guards, and the screws are probably standard.
There are several different ways that the forearm could be attached, so if you need that part of the stock, it may take a while to find one that will fit.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.