I've used butt joints and a biscuit joiner with good success for deeps and
mediums.  Very fast, very strong, and self clamping if you add a couple of
screws.  The newer torx drive exterior screws are great - they're self
drilling, and won't split white pine even when placed close to the end of a
board.  If you build a simple squaring jig, you'll have strong, square hive
bodies in a fraction of the time it would take to do box joints.

Regards,

Todd.

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