CJF - congratulations on your new rifle. That's a beautiful stock - is it original Dakota work? If not, who stocked it? Who did the case colors?
Mentioning the 1/8" lip, I imagine that a quick flick to the right would throw the extracted case free of the action, much the same as with extractor doubles. If needed, picking the casing out should become instinctive after a few rounds. The big rim on a 45-70 will make an easy grab handle.
28" barrel? That's amazingly long on a drop block - I'd love to see a full length photo of it.
