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Thanks for the advice Bob.
I've read the aricle by Dennis Persyk - "Pier Design Fundamentals" from the Cloudy Nights website and a 48" (122 cm) pier has a deflection of about 0.6 arc seconds.
One concern which I've now added to my questions is, "Would a pier of that diameter obstruct the scope and mount when viewing near the zenith?"
Hence my need for advice and performing some calculations before pressing onwards and upwards!
Yours is one serious hunk of metal!
Paul
PS What are you going to use for the top plate? I'm thinking of using a car disk brake with appropriate dimensions.
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