So... the first attempt didn't worked out well. After some days of showing it off, the Raspi fell off. 

Thats when I decided to make an own PCB, featuring:

• Four port USB Hub, to be used with other than RasPi A
• Some 5V, 3V3 and GND headers, to connect stuff
• RJ45 connectors for a nice look
• a bunch of break off pcbs to cover some holes. Cause the adapter will be L shaped so i have to pay that dead space anyway