EDIT: I made a youtube movie showcasing the gameplay on the map a bit. It shows all areas..
http://www.youtube.com/watch?v=vcH77-xiSm0
Make sure to click the HD button

Screenies:










Download:
http://tapas.affenbande.org/maps-dl/cores_v1r7.pk3
EDIT: Updated the pk3 with radar and missing script
EDIT: Updated the pk3 to new version
EDIT: Updated the pk3 to new version (added detail work)
EDIT: Updated the pk3 to new version (added detail work, incorporated samual's comments)
EDIT: Updated the pk3 with a sound entity for the central core (what 50hz hum and a guitar multi fx board can do for you

EDIT: New release (v1r7) with a bug fix (ceiling bug).. I hope everything's allright now with this package..