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Paul,
good start. The steel will rust eventually, but you can get around this as well.
Can't work out what you will do with the bit left over though. (2600mm long, 600 in ground, 1200 about deck).
I like to have nearly as much in the ground as above, but you can load the dice in your favour by making a decent sized hole, and filling it with a blob of concrete, with the pipe in the concrete.
Either way it will be a good solid base.
Make sure you can adjust the top plate though. Maybe think of a single plate welded, and another bolted to this, with slightly slotted holes, so some form of azimuth and altitude adjustment is available.
Gary
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