This is an idea for a a swift tower which is intended to be relatively inexpensive and that hopefully can be erected by a group of competent amateurs without the use of cranes or cherry-pickers - but you are responsible for abiding by your local health and safety regulations. It is a modular design for ease of assembly. If you feel inspired to erect something like this, then please get in touch to discuss options.
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Ceiling dimensions are 975mm x 650mm x 12mm
Overall dimensions of the roof are 1250mm x 1075mm
Although this sequence shows clearly how it goes together, it may be preferable to assemble the whole thing on the ground with the pole horizontal. Then, reduce the weight by removing the 4 cabinets, the bat slots and gable ends, then erect the pole with the ceiling, roof structure and roof, and add back the cabinets, bat slots, louvres and gable ends.
An additional consideration is to put a smooth metal sleave beneath the boxes around the pole to deter rats and squirrels.
The tower should be orientated so that the eaves face north and south, the gable ends east and west, to reduce overheating of the lower boxes.