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with a nice layer of rocks at the bottom, i figure that should work well.
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Actually, I have been working for years with my local extension office and they have finally convinced me that putting rocks or other low permeability materials in the bottom of your pot is actually counter productive.
What happens is you make what they call a "perched water table" which means that the rocks or whatever holds or disrupts the water flow and you have a water saturated space which is what you are trying to avoid.
I would recommend you make sure your soil has great drainage (30-50% perlite) to begin with and forget about the rocks.
You can go
here and on the right side of the page is a link to a video segment called "container annuals" where she briefly touches on it.
Good growing,
Plains