i have few suggestion to your idea which i really like btw.
"Großdeutschland" was opieOP division in entire Wermacht. They acually had a lot of heavy stuff and they were bloody elite. So:
1. becouse that division was very experience i would add upgrade for infantry (pio, grens, pgrens) called "extra training" - something like german infantry already has: extra unique abilities for each type of infantry
2. To make the concept more unique i would suggest Panzerfuzzilier rather than assualt grens.
3. 250 sdkfz is 4th MP call in unit so should be replace with ammo ability.
Thx for your feedback!
You are obviously right, the current version needs an ammo based ability and your idea of "extra training" can solve this issue. Maybe we could call this ability "Germany's finest" because on paper there was only volunteers in the division.
I would suggest that this ability only becomes available for Pzgrenadiers / Grenadiers because they were the backbone of this division. They should not get the 5th unit upgrade but some other buff. Let us collect ideas.
I also like the idea of adding a Knight's cross holder (to strengthen the "elite" concept) instead of Assgrens but Panzerfüssiliers would work well too.
Edited version of "Großdeutschland doctrine":
1. Extra training / Germany's finest (inf buff for Grens/ Pzgrens)
2. Counter attack tactics
3. Panzerfüssiliers (reworked - will help other commanders too) OR Knight's cross holder call-in(5men Pzgren unit, 1 Sturmofficer model / 4 Pzgrens, Smoke grenade AND Bundle nade, shared cool down)
4. Stuka zu Fuß call-in (8 CP)
5. P4 H-Version: Elite version of the P4 (passiv), can be build at the Support Armor Corps. (So it would come a little bit later than the T-34/85)