Recently finished work on this up armoured Cromwell tank using a bit of plasticard. The plasticard is where all the additional armour was placed increasing the armour from 76mm to 102mm. Seems these Cromwells were rare and were basically Cromwell IVs seam welded instead of riveted with additional applique armour added. Identified as a mark V(not to be confused with the MK VII which had improvemnets but no additional armour) the only real way to identify them was via the WD mark ending in a letter “W”. I also replaced the gun barrel with a 1/48 brass 75mm QF. Also decided to make a quick dio based on the black and white photo showing,”Gladys” from 1st rtr near Aunay-sur-Odon ,Normandy 1944.
Had fun making this Warlord kit , hope you like it ?
The model warrior 
Nice model, certainly looks the part in the little diorama.
I’ve not found much on up-armoured Cromwells.
Cheers,
Frank
They basically started seam welding tanks instead of using rivets from the mark iv onwards which provided a weight reduction. This then allowed to add much needed extra armour.