That's a really nice Bucks County LR....has all the features too. A couple of my early BC builds also had .54 swamped bbls {C weight from Rice} and if done right, can still be slim.
Used Goehring's # 47 TG which actually was a Verner and had to file the thumbnails fore and aft. Didn't know that he had a Shuler TG. Can't tell if the Pbox lid release rod is under the toeplate?
Nice job on the entry pipe....that can be a deterrent in making a BC LR because it can't be bought. Your sideplate is nicely done and resembles those of Verner.
The Bplate I mainly used came from Dru Hedgecock and is virtually the same as those used by Shuler....Dru is retired and can't find that particular Bplate at any other supplier.
The top BC shown below is my 3rd attempt of a BC LR and is a .54. The bottom pic has the Bplate that I used on most of the BC builds and resembles a Shuler BPlate.
Again ....thanks for posting a beautiful BC LR......Fred