Solar Water Heater Frame

I managed to set up the solar water heater frame.  It seems a little flimsy to support the water tank as the water tank is 100 kg empty.  It is 250 litres capacity, so this means the total weight will be 350 kgs excluding the solar tubes.  I will be tightening all the bolts and nuts and then mount the tank.  After that I have to wait for my plumber to come and hookup the water.  Then I can hook up the solar tubes.  I am looking forward to commissioning my solar water heater soon.