The Antec Skeleton PC case takes care of ventilation by stripping out most of the walls and slapping a 250mm fan on top; in total, there’s room for 7 expansion slots and 4 drive bays.
Evil Mad Scientist Laboratories has a DIY for making your own Fraction Adding Machine out of a Rice Krispies Box, glue and tape. It’s based on an actual 1952 calculator.
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