Morris-Commercial C8 Gun Tractor body id please?

[David_Hayward (RIP)]

Can anyone identify the style of body on this Morris-Commercial FAT please? Census number H5847572 to Contract S.5728 as "Gun Tractor FAT". IT'S NOT A REBUILD OF THE C.8/MG ANTI-TANK PORTEE BECAUSE THAT HAD THREE-PIECE FLAT MUDGUARDS INSTEAD OF ROUND ONES, I.E. TO "C/8/AT MARK 111 AIRPORTABLE" WHICH LACKED THE BODY STRUCTURE OF THE NON-AIRPORTABLE VERSION. However the series show the body being dismantled and then the end result is an Airportable truck without rear frame, doors, canvas and with fly screesn for the driver and passenger. Now, given that this is a rebuild on a Gun Tractor, is it a conversion shown in pix or a rebuild that could be stripped down to insert in a plane/glider and the actual stripdown is being demonstrated?

I SUGGEST NOW THAT IT'S A REBUILD OR VERSION OF THE M-C C.8/FAT Mk 111 Number 5 body, without side doors and side and rear panels. Comparing the bodies this seems to be correct, but was it a rebuild or a version of the No. 5 body?