Thanks to all who have helped!
I’ll get pictures of this project as it comes along.
Fully engraved Kornbrath / Swensen 1903 receiver, original new old stock Krupp octagon to round full rib 400 barrel, Kornbrath engraved Elk pattern bottom metal, Kornbrath stock bolt, vintage correct express sights and Rigby bolt peep, engraved grip cap, original G&H trap butt, etc.
My plan is for it to be remake of Col Whelens original 400 which is featured in Mr Rifleman in its current rebarrelled state as a 35 Whelen. Steven Dodd Hughes photographed the rifle a few years back and pictures can be found on the web. That rifle has an engraved receiver in the same pattern as mine.
Should be an adventure!