Mike Krause in California has been making exact replicas of the .45 Luger for a number of years. He had access to, and reverse engineered, the .45 Luger formerly in the Aberman collection. I suspect that Mike has made engineering drawings for his production but I doubt he would be willing to share
(but I could be wrong!). I purchased his production serial number 7 from him quite a while ago. I don't know how many he produced or if he is still making them