With the guy standing there next to it, and holding just one of the pieces in his hands, it puts into perspective the size of the statue. Ultra Magnus indeed!
The colors would be re-adjusted. I think IA will nto sure pure white as it will be yellowish sooner or later. But consider to adjust to lighter silver / grey
The blue color also would be slight darker, and try to have semi gloss effect to make it look a bit more metalic