It's not the first Scott-built vintage hammerless double rifle I've seen with the barrels fitted to the standing breech in that manner.

Came damn close to buying a crystal-indicator sidelock Climax black-powder double rifle that looked a lot like this one many years ago.
It was definitely made that way.

Having said that, this one is a bit "over the top"...

Recent deep gouges in the top of the right barrel are most unfortunate.