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Imagine you take a knife and slice the tower to several slices horizontally. Now draw the cut profile of these slices at where they were cut make a form. The more slices you have, the more accurate the form will be.
Oh...while you're waiting...
The slot can be done with a void form after the fact, or as I did it here, by just including the notch into the the lower and upper shapes prior to making a form out of it.
Aaaaaaaaaannnnnnndddddd here we go...
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