Looking at it within a historical sense, the vast majority of Bucks and Lehigh rifles used German or American-german styled locks. Yes, you can find some that lean more toward English styling but they are within a notable minority. Whether one style looks better than another is a matter of personal preference. I personally prefer a funky American-forged/german styling myself.
I've seen about three or four, all on the slightly earlier end of the spectrum (for Bucks Co.), that made use of the cheap 'tulip' trade locks w/ no internal bridle. They look great and factually, all of the locks are still functional (because yes I played with them). They don't have to be a watch, they just have to whack a piece of flint against a frizzen and make sparks to ignite some pan powder.
As I mentioned, the large Siler is a good canvas to use for modification. Most of us started out using it as-is and I pretty much cringe at that now, although nobody ever accused one of being non-functional unless it was assembled in a grossly bad manner. The plate needs reshaping, the pan also, the cock is best to toss as is the frizzen spring (stylistically, not functionally). As a blank canvas, a LOT can be done with it, and furthermore internal replacement parts are easily available and easily fitted.
Most Bucks and Lehigh guns run the rammer hole darn near into the barrel breech at the breech end, and it's very difficult to style one correctly if there is too much of a wood web there. Expect to either notch the breech, notch the bolt, or both.
