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Decisions decisions now - thanks for all the excellent advice guys.... I'm starting to lean more towards the concrete pier (prob 250mm) for a couple of reasons:
1. seems to be better in terms of vibrations etc than similar steel.
2. cheaper - I'm going to need a big plug of concrete regardless - adding the pier whilst pouring won't be too onerous
Obviously my first point of portability comes up - but to move a steel pier I'd still need to pour another big monolith! - my initial 5mm thick pier I calculated would weigh 52kg or so, so with 10-12mm steel and more ribs etc it would likely hit 80kg plus.....
Will keep brainstorming......
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