<I deleted some information, because after some research I'm in doubt if you did mean the external extension on front of the Koffer or the forward entrance door on the right side as entrance to a storage compartment?>
Regarding the 305 with the special railing on the roof: This is no Kfz 305, because the distance between door and windows is too large. This is Wehrmacht Funkkoffer. Unfortunately I've no information about this item, because I'm only collecting Luftwaffe airfield ground equipment. I'll ask Reinhard Frank asap.
the pictures are from the manual "L.Dv. 783/15. Ausrüstungsverzeichnis und Beladeplan für Kraftfahrspritze KS 8 Kfz. 305/108- Bauart 1941, Ausgabe März 1942" The lights on the cap are only known on fire fighting vehicles. The glass was blue. It seems these lights were abandoned starting mid 1943 on new vehicles. Older vehicles remained these lights.
A picture of Room No. 4 taken from the mentioned manual:
A picture of the "Kraftzugspritze KzS 8 Bauart 1939" taken from the manual L.Dv. 783/2a, issue November 1940:
The previous version had an open cab.
Maybe I'll meet Rainhard Frank tomorrow.
Do you own resp. restoring an genuine Opel Blitz truck?
hello, as far as i know the german company Gaubchsat fahrzeugwerke from Berlin-Neukolln made also wooden radio cabs problem verry little info can be found about manufacturers of cabs , as i read there were about 100 different models also the 1.5t opel blitz existed with radio cab but again as good as none info avaible cheers phil