Nik,
let me just state that you are the single and only person who has asked most openbsc usage related questions on this list in the shortest amount of time.
Dozens, if not hundreds of other people have managed to compile, configure and run OpenBSC without raising the same number of questions on this list.
If anything, this indicates that you are trying to abuse the OpenBSC developers for getting free help in your particular (most likely commercial) application.
I suggest you either try more by yourself, or you try to get soem kind of comemrcial training/consulting/support arrangement with any of the people who have the respective experience. This way you would get what you want, in probably much less time, and without putting load on volunteers who hang out on this list and want to invest their time in improving the project and its documentation - rather than helping only one person.
All the best, Harald