Hi Dario
You did an excellent job with the interior. The rusted pipe almost fooled me into thinking it was another photo of the tank being restored!!
Also, I really like your idea for the diorama because it is possible to tell a story with your plan!
I wonder if you will need to add some figures to make the story more obvious. Perhaps you could have a few soldiers looking at the tank from the road, or firing in the directio the antitank shell came from?
Perhaps you could make the scene look like it just happened. Two members of the crew could be climbing out of the tank with some cuts and bruises, and since the commander and gunner were in the turret, they could have already gotten out of the tank. Perhaps the commander could be inspecting the damaged drive sprocket and the other crew member could be trying to lift the track that is still on the road?
Or, if you didn't want to do figures, then perhaps you could include a recovery vehicle or an ambulance on the road ready to help.
Of course, these are only suggestions that I could think of now. It is your diorama and you already have a great idea, and you are already much more creative than I will ever be!
Cheers,
Derek