I agree, one hell of a good collection!
What is the code/year on the MP 40? What I see indicates 1943 or 44. Is the MP 44 mag loader an original? If so how marked?

I would correkt a few minor errors:
The P.38 became general issue in 1940, but the Luger was produced into 1942 because P.38 production wasn't yet up to requirements.
The MP 40 was never replaced by the MP 43/44 series and was never intended to be. The MP 43/44 was intended to replace the K98kicon, which it never did.
The MG 42 was intended to replace the MG 34, but never did. The MG 34 continued in production untill the factories were over run in 1945.

Since you don't have a G/K 43 to show, here are mine to fill the gap.
Sarge
Attachment 28076