Sorry for the tone. You may not have any others, but I have seen plenty at guns shows, usually being passed off as genuine. I have no problem with a made up A4 as long as you don't sell it claiming that it is original.
I just don't see much point. To prove that a scoped A3 will shoot? Most older shooters knew that 50 years ago. To fill a gap in a collection? But it doesn't, not really, any more than a new Colt SAA fills a gap in a collection of 19th century guns. Just for fun? Best reason, and it is the point. Good luck.
Jim