I have a question on your movement rates. Let's say a Regular Calvary unit with a move of 180mm moves 100mm in the open and then enters and exits a “25%” terrain which is 2mm wide.
How many millimeters of movement would the Calvary have left upon exiting the terrain feature?
In the Pz8 rules we could never figure out how to do this so I made up the rule that all units must end their movement for the turn when entering these types of terrain. Movement in and out of the terrain feature is then determined by the terrain.