Karsten,
none of the Caterhams hold an EU type approval. The EU commission is currently working on having harmonised the type approval, so that there no longer will be any local demands to meet.
In this new directive draft there is a section describing cars produced in low volume, that's the part reflecting to us. I would imagine that I could find a German version of the draft, and email it to you, but it has not yet been implemented, and some of the issues still discussed are the crash tests. It is pretty heavy reading, 'cos it is 243 pages in my language (Danish)...
The Caterham holds a UK low volume type approval, which is a local UK thing, which I recon makes it easier to pass the SVA test - in England (just read the threads about SVA in NI 🙆🏻)
I don't know the local German regulations to be honest!
/regin