Cool idea.
+100% penetration for multiple shots might be a bit too much though, compared to similar abilities. +40-50% would be better.
What should be done with Stug E's vet 1 ability you think?
Agreed 100% seem a bit too much.
On the other hand I would rather see stationary camo on stug as a vet 1 ability.
I would try hollow charge AT rounds with low damage penetration maybe some deflection damage.
The unit is a bit expensive for an AI only unit and imo should be able to defend it self vs light tanks.