As you can see you have a lot of place inside:

First work is to remove the smoke unit (louder than the engine sound) also it's good when the tank isn't moving but compare to the original model, you don't have the black smoke each time that you're moving it. For the Shtora system I am using the bb firing command.
I removed the front parts to place the front reactive armor:

Also first test with the side armor plates:

Next to come, the "red eyes" of the Shtora and the reactive armor