I've started some indepth planning. Specifically..
1) AGN will be secure. The Finns will hold the Volkov-anchored line, There is a 3 hex wide span immediately north of Lake Ilmen that German units can only protect, but it can be weakly held because 1) any attack thru such a narrow front can be easily pinched off and 2) this area offers safe havens for up to 12 divisions which can be easily put to use if needed.
2) This leaves 80 hexes twix Lake Ilmen and the Black Sea. My plans are an ultra-conservative approach, which I know will get a severe tongue lashing from MT
A) The northern-most 20 hexes will have level 2 or stronger forts with a double row of forts in the first 6-7 hexes. This line cannot be assaulted until late Dec/early Jan and should hold thru late blizzard. I will probably not hold the mountains
B) The southern-most 20 hexes anchored on the Black Sea will similarly have level 2 or stronger forts. Since this line is 20 or so hexes from the present front line, it will certainly secure this sector.
C) The central 40 hexes will be covered by a continous line of units retereating 2 hexes or so a turn.
D) With roughly 105 German infantry divisions, 30 Pz/Mot divisions, and 8-10 regiments working with 40 weak Allied units (those not needed for garrision duty), all backed up by a reserve of 10 mountain reg/div's to defend these 80 hexes, any blizzard offense will be contained.
WITE is a good addiction with no cure.