Although I think heavy walkers would be cool, they really do not make much real sense for either side. If you look at the fate of the Jagdtiger and other such heavy monstrosities, which tended to break down or just get splattered by air units, heavies proved to be a real waste of material.
Konigsluther?? Where has that popped up? I would love to see that.
I also wonder if walkers play such a central roll in frontline warfare. Sure you have people like Panzerprinz and Sigrid who have been on the Eastern Front, but are they holding the line or are they a strike force? If we had the stats for the extrapolated allied or axis tanks, we could see how walkers fair against them. Even in early 1940, the germans had incredible efficiency in fire control. I would say this would give a Panther 2 shots against a Allied Walker, and probably destroy it.
If you follow the storyline, the Axis are cranking out zombies to give them manpower hordes. If they are so low on manpower, perhaps walkers are the way to go, since they have a driver and autoloaders. So one walker can operate as a tank with 3 or 4 less crew. This would be the logical reason. Otherwise you could have Panther 4 and Tiger 3, suped up versions of their early war counterparts, with ceramic armor, dual 120mm cannons, autoladers, rockets, you name it.
A heavy walker would have what features? I am assuming 4 legs, or even 6. Dual or even triple mounted heavy caliber guns. Obviously heavier armor, or would their be room for power fields?
I would like to see a 6 legged walking troop carrier, like a SDKFZ with 6 legs and MG48's, able to carry 2 squads into battle.