Ok thanks. I have decided to go back to a concrete slab with an isolated pier footing/pier base. the slab will hopefully ensure more stability in the walls to ensure roof runners stay true. Walls of 4 x 5m shed will be reduced to 2.1m height to allow lower angle views for the scope. Now to level the area, pour the footing, get the slab pourer and get shed erected!
Not sure about the telescopic pier. I would assume there could still be some movement in it? Will heed the advice on the packing sand buffer and styrofoam or similar isolation layer.
Cheers
Mike
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