One piece of advice regarding the concrete. When you calculate how much to put into the base plate, use the same amount as us Engineers do to secure pumps onto base plates. Use a minimum of 5 times as much concrete as the whole scope weighs (ie if it weighs say 50 kg, then use concrete 5 x 50 = 250 kg of concrete, or roughly 0.25 cubic metres (thats a cube of 630mm x630mm x 630mm. If the pier is quite high, though, I would add more, because overturning moment would increase the higher the centre of gravity is. You dont want it wobbling just as you are taking that winning photo
