>> think you end up with a five foot by three foot tower capable of I think 12 metres height.
12metres, crikey! - that's some tower.
>>it must be level as it will twist. I have a number of chunky pieces of timber for that.
The one I hired a few years back could be adjusted to take into account any uneven ground, which was ideal for me at the time because I had to work over a small flight of steps leading up to the garden, so two of the legs were actually standing on steps lower than the patio (if that makes sense) It looked totally unsafe - but I lived to tell the tale.
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