I agree completely and have been saying something like this for years - the C96 is one of the most iconic pistols of all time but they haven't made any new ones since the 1930s and most of the surviving examples are either completely worn out, in a "weird" calibre, or both. It astounds me there's a market for modern reproductions of obscure mid-19th century percussion-cartridge transition model revolvers, but not the C96. As you say, making the uppers for them would suffice and mean people could put the worn out C96s back into commission and keep enjoying them.