Hi Darren
Not sure if it's that complicated that it needs plans.
One old brood box.
Piece of ply screwed to top and bottom............roof and floor.
One 20mm-ish whole drilled into the bottom of the box to form an entrance.
Fill with a few old frames, you may wish to pin them in place if you intend to move it about easily and add a swarm lure for extra pulling power
It does not need to be any more complicated than that.
Regards Ian
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