Spent a good part of today working on this...doing research on arrival times of both Allied and Axis units in Normandy and trying to figure out how best to adapt the North Africa Campaign system to the Normandy battles. and to also make it a fun, playable campaign.
One problem is that CMAK in June/July/August 1944 doesn't have all the hardware available in Normandy, especially the lack of Fireflies and the absence of Cromwell tanks.
The other issue is how to simulate Allied air power, artillery superiority and naval artillery while allowing for playable battles... and on the Axis side the heavy Tiger units, Nebelwerfer and 88's and preponderance of AT guns.
The air superiority can be abstracted in that Axis units have severely restricted movement allowances -- maybe introduce a weather rule there.
The other issue is that without prebuilding lots of maps, we can't really get good bocage terrain for the QB's -- so heavy tree cover will have to suffice, I guess.