Bones: you have asked for opinions on various aspects of the rifle. When you get answers that don't fit with what you want to hear, or that you don't like, I see you are offended. Rather than argue, listen to what is said. You will do with the rifle what you want anyway, and by all means, find out for yourself. I wish you joy of it.
But this rifle has issues. If that bore is not absolutely polished and rust free, it is unlikely to be particularly accurate, will be difficult to load and clean. Rust is cancer. If not completely cut away, ... I hope you get the picture. It needs to be lead lapped-likely an eight hour job...about the cost of a new one. To repair the front sight, measure accurately the distance between the dovetails, make a blade that spans the bases, remove them support them in a jig at their correct spacing, and silver solder your new blade to the bases. A flattened nail set in a hole in one of them isn't even up to the quality of this rifle.
Remove and keep that interesting rear sight, and replace it with one that suits you. That rear sight may have been made that high to get the shooter's cheek high enough off that exaggerated comb to actually shoot it without breaking his face.
To discuss the butt plate, I for one require more images of the butt stock, or at least some measurements: height, thickness, pitch angle, etc. Photos are best next to having it in hand.
Without insulting you, the rifle is not of much value. It would not hurt it to tinker with various areas to make it suit you better, and might be an enjoyable past time. So again, listen to input you requested, and enjoy it for what it is.
