LPKF Multipress 6/8 layer pcb stack up

[tomgat]

I acquired a used LPKF multipress, and have been pretty impressed with it doing 4 layer boards.   I can now reliably make 4 layer boards in a couple hours using it with their Contact S4. 

However, there appears to be no documentation on doing 6 and 8 layer stack ups.   Anyone out there every tried doing this?  The multipress doesnt use press pins, so any idea how you align the 2 core layers?

Any comments are appreciated!