Sandbox mode

Right so this is my first ever thread, here goes. Not sure if this has been done before, but have the option of a "sandbox" mode.
With this you could create a custom army, with the option of army size, troops and spells, with which you could attack your own village to test it. You would have access to all types of troops so that you test against the possible th10 attack or if you have a low th then you could create a smaller army. This would cost nothing, just act as either a bit of fun or test your base against a serious attack, ie test a war base you've been thinking of using.
Some features would be:

• You would have the option to test your village or war base.
• It would show the percentage of loot you would lose.
• Choose your cc troops to defend with to see which works best.
• Able to show a replay to your clan mates.