Whenever I build a Mauser rifle, I replace the trigger unless the owner specifically requests that the original trigger be retained (which seldom happens). If I am building a sporter rifle, I typically recommend an FN style bolt shroud and a side safety, it gives a much more refined look to the finished product. Replacing the trigger is very straightforward, as is bolt shroud replacement.
Never try to educate someone who resists knowledge at all costs.
But what do I know?