OSPREY MODELLING 19 WW2 GERMAN 15cm sIG33 BISON & GRILLE SELF-PROPELLED GUNS SPG
The easiest solution was to modify a spare tank chassis to carry it into battle. A sIG 33 was mounted on the chassis of the Panzer I Ausf. B, complete with carriage and wheels, in place of the turret and superstructure.
Modelling the German 15cm sIG33 Bison and Grille (Osprey Modelling) paperback
Publisher: Osprey Publishing Sep 10 2005. A copy that has been read but remains intact. Internal SKU: A02A-02386.
Modelling the SdKfz 251 Halftrack Robert Oehler German WWII Armour Vehicle Tank
How to Model the German WWII Armour Vehicle.