Here - one of the first Ideas Lego sets based on James Cameron's Avatar - is a recreation of the final fight scene between Jake Sully riding the Thanator and Colonel Miles Quaritch in the AMP mech suit.
It's not perfect, but as an idea, please support it if you would like to see Avatar LEGO become a real thing.
Considering there are another 4 Avatar films in the making (Avatar 2 coming 2022), and over 10 years since the first film, I was surprised to find no Avatar themed LEGO... thus far. I think now is the perfect time to explore the rich and colourful world of Avatar that will only get more exposure in the coming years.
The set pictured has 570 pieces so is relatively small. The AMP suit is 26 studs (20cm) tall.