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I would make the concrete base 600x600x900 at least and not a cube, but pyramidal.
If you want to keep the two part design, extend the flanges on both tubes down so they overlap by about 5cm and weld them together.
Filling the tube with refractory sand is a good idea. Metal "rings" and will give harmonic vibrations if tapped or moved by low frequencies (nearby truck etc.). Washed sand has a lower density and will not quite do the same.
The top tube, using your height for scale, looks to be around 200mm. What wall thickness are you thinking of using? I would recommend 3mm. That makes it quite heavy, so please consider.
Allow 1 centimetre gap between "future decking" and pier.
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