I stumbled on to this while looking for other stuff today..

http://panzertracts1.tripod.com/images/berthac.jpg

http://panzertracts1.tripod.com/images/bertha-2.jpg

http://panzertracts1.tripod.com/images/bertha-1.jpg

and this is the home page, some pretty neat info. here on German tracked artillery and tanks...

Welcome to PANZERTRACTS - Your source for German WWII AFV Information

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"Don't be a fool and die for your country. Let the other sonofabitch die for his." George S. Patton