I replaced the gun barrels with those of the RB Model sets 35B74 (75mm M2 L/31 and 37mm gun) and 35B82 (M1919 Browning machine gun). The upper hull, built up from many separate pieces, was not the nicest to put together, with a few gaps to fill. I think this should either come in fewer pieces or have an underlying frame onto which they are attached, such as is done for the turret in this Panther model.