Terry,
you are correct about a crew of 6, but K&C only gives us 4 gun crew so its 2 short. Reason for only 4 is .... the officer is NOT one of the gun crew, as the gun is commaned by the No.1 usually a Sergeant. The officer would be in charge of a section of 3 guns, and so not a crew member.
Lets hope if (and when) K&C release a new version, maybe Europe? we will get a full crew and the officer as an add-on figure. Maybe we could get a double release, one in the desert and one in Europe, but with different crew, maybe bare-chested in Africa?
The shield is raised in the firing mode, as protection for the gunners, frpm small arms or shrapnel and lowered for towing, and this is beacuse its high and could snag on trees etc if raised.
I have an original Gun Mannual c 1940 for the 25 Pounder QF Field Gun, and has detailed line drawings for the gun and equipment, and it expalins it all there.
Hope this helps,
John