Could anybody point me in the direction of concrete information (or drawings) of German WWII artillery set up and the defences (against ground/air attack) around such area?

If you're looking for books, you can try the following:

Osprey:

German Field Fortifications 1939–45
ISBN: 1841767611
http://www.ospreypublishing.com/title_detail.php/title=S7611~ser=FOR~per=2

88 mm FlaK 18/36/37/41 and PaK 43 1936–45
ISBN: 1841763411
http://www.ospreypublishing.com/title_detail.php/title=S3411~ser=NVG~per=2

Crowood Press:

http://www.crowoodpress.co.uk

Germany's Guns 1939-45
Author(s): Gander
ISBN 1 86126 110 1


Unfortunately I haven't read any of these so I can in no way endorse them.

If you're looking for a website, go here: http://www.carlisle.army.mil/cgi-bin/usamhi/DL/showdoc.pl?docnum=352 German fortifications start on about page 54, drawings begin on page 57 (small bunkers) and continue on up through the big stuff. Have fun!

BTW, the whole Handbook on German Forces (TM30-410) can be found in the World War II section on this page: http://www.carlisle.army.mil/usamhi/DL/chron.htm

Thanks for the fast and concrete replies.

Armorama rocks, and this is to a large extend thanks to all these useful contributions!!

Happy New Year