Seems to be a good solid class, but to keep with the theme it's based one I would include things that allow the class users to ride constructs that at gargantuan or larger from the inside, specialized constructs for the members of the class, and add the ability for said constructs to have the inherent ability to form together with other constructs belonging to the same class owners.

potentially making the constructs similar to the weapons of legacy so that level up with you