OK Hanshi - Mikes right " It is what it is" and that means you can"t hurt the D@#n Thing. No matter what you do it"ll likely still shoot
That said, it offers an inexpensive gun to learn on.
It was asked 'What to do?" So let see what we can do with it.
For starters, you cut off the recoil pad. Most of these had long pulls anyway. No butt plate will be OK or fit a plate of your making or a sand cast plate. Remember flatter will equal less felt recoil but in a 50 cal pick what you like.
2nd, most factory guns have a ugly hump of wood in the stock just behind the breech. Cut down the wood and tang if need be.
Straighten out the top line of the wrist to be more parallel with the bottom line. Round out and carry the wrist back into the butt.
Cut down the and slim the comb till you easily see thru the sights. The front of the comb should be more pointed and not the big fat round as viewed from above.
The butt may have enough fat on it to carve out a little bit of a cheek piece.
Cut down and reshape those big fat lock panels.
Pick a trigger guard of your liking, file it up and inlet it. Just pick one that will span the old inlet. They are cheap from TOTW and anything will beat the stock one!
Consider casting a pewter nose cap. lots of good advice here on the subject.
Slim and round the forearm, top bottom and sides. Reveal a bit more than half the side barrel flat. Taper the bottom from the breech forward to the RR entry. Round it up bottom to top, rolling sides to almost knife edge at top by barrel.
Maybe add an under rib - could even be wooden
Scrape out a real hickory RR with a taper and swelled on the business end.
Look at some of the rebuild projects that have been posted in the past. Off the top of my head, one Lyman GPR by D. Taylor Sapergia stands out. There have been several others that really improved the fit and looks.
These are just some of the things you might do to make your rifle a bit more presentable on a budget. I bet you'll enjoy the project and learn a bunch - Then you'll be more confident if you choose to ever build one from scratch.
And remember, You can't hurt the D@#n thing
Just do it. Hope this helps .........................Lynn