Hi Alfred
Just to warn you that this version had a longer chassis.
About sources:
There was an excellent build in an old AVF modeller magazine.
Below you can find a excellent German modelling blog which can give you many deatils:
http://www.modellbauforen.de/cgi-bin/ikonboard.cgi?s=c7dad8c3405318390e5516fbcaa639d2;act=ST;f=17;t=3707;st=0
I know I am late but maybe still useful.
Your Befehlspanzer 3 looks really excellent.
Regards from Vienna
Robert
Visit our modelling show "Go Modelling" in Military Museum in Vienna at 9/10th march 2013
www.ipms.at