One more thing on flight cases: while rectilinear is obviously the way to go for stacking and actual shipping, if you're making one simply to house something that will never be subject to the tender ministrations of baggage handlers, you can get a little creative with the shape.
A good example is this Flight Case for a Prusa (3D printer), posted on MakerBot Industries' Thingiverse, put together by Belgium-based Pieter Possenier.
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