"This build was certainly fun. Worked on it after work and took me around 6.5 hours taking my time. The build looks quite appealing and seems to match the appearance from the Avengers age of Ultron quite nicely. One minor gripe about it's appearance is the yellow lighting for the Arc reactor instead of blue but it's minor because the lighting certainly ads to the set.
I like the design in that with the joints you have a level of flexibility on how you wish to set it up for posing.
One thing that I think could've been worked on is the tendency to lean forward or backwards based on the pose for stability like maybe special weighted bricks in the feet but this isn't a fail on the set. Positioning of the extremities can offset that and aide the sets tendency to lean."