This is only a tank,it can't be transformed (I don't know how to) but still, imagine
that it can, how complex would it be. Transformers War for Cybertron and Fall of Cybetron are by far the best two games that ever came out, so this tank is based on Megatron from both games, and this is what I made.
It has more than 3500 pieces. It's long about 66 cm (90 studs), 27 cm (36 studs) wide and 18 cm (24 studs) tall.
I hope you like it
These two images show how much the cannon can be moved up and down
And these two show what I started from and they are middle and lower section of the tank