Sure thing.
1. The tank looked completely destroyed while in the mission.
2. first of all, all 3 spaces were free. I clicked one of the empty spaces and then clicked the only available tank option, then the dialog appeared "Are you sure you want to buy Hunter [yes] [no]" - the moment I click yes - the game crashes.
3. 900k
4. I'm trying to buy a tank in the original base. However, I relocated one of the original tanks to another base.