Where to find the plans of my 1935 boat

[Basil Carmody]

I'm trying to follow every possible path to find the plans of my boat designed by Reinhard Drewitz and built by W. Buchholz in Berlin.

Do there exist archives of W. Buchholz?

A Swedish friend has found the plans of several Scandinavian boats of the 1930's in the archives of Norske Veritas.

I think that the German counterpart to Norske Veritas was a German Lloyd's. Do their archives still exist?