Terry,
I'm not much older at this than you are. I just fired my "shooter" for the first time last weekend and it was a thrill!
Check out Shadow's videos on Luger disassembly and then take your pistol apart a few times. You'll quickly see that just about every component is machined rather than stamped.
Go to YouTube and search for Shadowdog500. Here's one of his videos:
http://www.youtube.com/watch?v=HkXr4dXT_Os
I could be wrong on this, but IMHO, there are so many complex and intricate steps involved in the machining and construction of a Luger that it isn't economically feasible to reproduce them. A few companies tried, but apparently there wasn't enough of a market to sustain them in business.
If I'm off base, some other members will correct me.
Dave in TN.