Plans for 1940 high level game in 3mm

A Belgian civilian and a German soldier look
at an abandoned French Char B1 in the village 
of Ermeton-sur-Biert near Namur sometime 
after 14 May 1940.

Doing a high-level early WW2 game in 3mm has been on my hit list for a long time, and I've recently been researching the Battle of Hannut where the French 2e and 3e DLM met the 3. and 4. Panzer Divisions in May 1940.

The forces will essentially be organised on the 1 base = 1 battalion scale used in Tim Gow's Megablitz, but following my career towards grids and hexes I will probably be using Bob Cordery's Hexblitz variant or something similar. Bob has recently been working on Hexblitz II. I have also been looking at his even higher-level game, Operational Art. If none of these are to my liking I can do some sort of mash-up. Doing something original is also a possibility, but I feel I need greatly to improve my understanding of game mechanics not to mention my military education.

I intend to stick with the 4cm wide bases which Megablitz/Hexblitz players use for 1/72 models, but I'll be decorating them with multiple 3mm models. I may make company-size units (e.g. Recce) smaller, and transport units narrower and longer, but 4cms x 4cms will be the standard. (If I progress to doing later war Eastern Front, it seems I should be doing Russian Regiments on larger bases.)

I will be using felt for roads and rivers but may make up some hex-shaped woods and BUAs for placing over the Hexon hexes. Woods and BUAs will need to have a fairly even surface as the unit bases will sit on top of them.