Hey, I like that! And I'm not usually too impressed with most modern attempts at German rifles. Very Prussian!
I'm having a hard time seeing details on my screen, but a couple of things you can do to make it more "authentic" is to take the triggerguard, and hollow out the "lobe" at the rear of the grip rail (assuming you haven't done so, I can't see). These were forged to shape, and folded up into a hollow cup (even the brass ones I have seen are hollow, not solid).
I can't see if your rifling is round or square grooves. On the rifle barrels I have seen, round grooves will have their own individual "crowns", in addition to a very narrow bevel crown. These can be filed out with a small round file. I have yet to figure out how it could be done with square grooves, but I don't think I've seen it done with square grooves. Otherwise, muzzles are cut off absolutely square, with no bevel crown at all. At least some of these, I believe, are coned. I have seen a barrel that I know was coned. You could see it looking into the barrel (which was pristine). About a couple inches into the bore you could see where the flare began. The bore is flared, AND the grooves are flared just the same. I'm not certain exactly how it was done, but I'm almost willing to bet it was done with some kind of drift or swedge, cleaned up with a cone shaped reamer after swaging the barrel out.