It is done!
I have both ‘core’ sides for British vs. German conflicts using IABSM v3 in Normandy. Basically this means a company of infantry each, plus 10 Shermans (including a pair of Fireflies), five Stugs, and a couple of Pak 40 ATGs. I suspect I may be fielding Shermans that didn’t exist in the immediate aftermath of the Normandy invasion, but I won’t tell, if you don’t.
Here are some shots of my freshly painted and based Brits, as the German side has been well documented here.

Platoon, forward! I’ll probably end up color coding the bases, at some point, to make identifying units easier. Let’s face it, 6mm WWII infantry are pretty difficult to identify from more than a few inches away.

Droopy barrels are a hazard of 1/285 armor. If I were less lazy, I’d replace them with brass. But I’m not.

Badly lit Shermans. Ironic, for the disparagingly named Ronsons, eh? I went a little wild with the decals on that Firefly in front of the manorhouse.
Now all I need to do is learn the rules and shanghai some of my friends into playing.