Story, those are interesting sights. It would be cool to have a row of folding leaves. However, I'm Thinking of what John Taylor wrote in African Rifles and Cartridges, that it is best to have just a single standing rear sight inclined toward the muzzle, with a notch just deep enough to allow the bead to snuggle down all the way. With my eyesight, an open rear sight would have to be located about halfway down the barrel to be usable. I can't imagine a row of folders looking good that far down, but they might. It's something to think about.

also, I have Lyman receiver sights of steel made specifically for the No4 rifle. A peep sight would certainly be better for me to use, and the steel could be blued to match the rest of the rifle. It would be exactly a Lee Speed style sight, but it would allow for better hits.