> I've successfully overwintered two queens in a single, divided by a
> vertical plywood divider board, covered by an excluder, with a shared box
> of honey above.  The workers have the ability to readily pass between the
> two queens' brood chambers.  I observed good queen survival in the ten
> test hives.

This has of course been done many times, a beekeeper I knew did it back in
the early thirties.  A slight variation was done here recently by using 2
nuc boxes and clipping them together.  The benefit was it solved the problem
of requeening both sides.  Simply removed them both and add two new ones.

Geoff Manning

Very eastern Australia

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