You could save points in the terminator-squad, equipping all of them with fists is quite expensive and not really necessary, axes are okay.
Haven't used Zombies that much myself but I'd make a large squad of them (up to 35) to have a large tarpit that can slow down what you want.
Additional armour is really not needed. Once the enemy fires on your Rhino it will go down and extra armour doesn't change anything about that. Usually the Rhinos have done their job when they survived the first round and flatted out to bring the
PMs where you want them

.
Typhus indeed gives Obsec to
PMs, he has the same rule as a Chaos Lord of Nurgle.