A complete overhaul and re-development of Gary Grigsby's War in the East, with a focus on improvements to historical accuracy, realism, user interface and AI.
It is possible to build one with two guards rifle divisions (formerly motorized divisions) and a regular motorized division.
The trouble is it's so hideously expensive in terms of vehicle needs, it really isn't worth building. You can do a guards mechanized corps for considerably fewer vehicles.