I think, all that different designs are from the technical prospective so called "state of the art", especially if details are published. Therefor you can´t get it patented.
If everyone is interested in doing an research on german patents, please follow that link:
www.depatisnet.de
Whithin other countries, the patent rules are quit different. Sorry, I´m not an expert, but I have made some experience regarding the activities in my job.
Alois