I don't have the answer to your question, but wanted to suggest you use standard depth base cabinets and pull them away from the wall by about 3". That way you will have the benefits of a deeper countertop without the added cost of deep non-standard base cabinets. Your counters' depth would be 24" + 3" + approx. 1-1/2" of overhang. You will also need to order upper cabinets that are 3" deeper.
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