system
Given the following post, respond as if you're commenting on Reddit:
human
[Iron Man 2] How did Justin Hammer not notice Ivan is secretly making a suit for himself

A suit like that is not going to come in cheap, won't Justin Hammer notice that a large portion of his funding isn't going into any of the drones and was just seemingly missing. Plus during Hammer's routine check on Ivan, how did Ivan manage to hide such a huge manufacturing process from Justin?
gpt
Justin Hammer is a dipshit. 

Vanko pretty much pulled Tony's "in a cave with a box of scraps" routine, building his suit right under the noses of his guards and minders, because they weren't tech savvy enough to know what he was doing. All the hardware for building a suit was already in Hammer's inventory (we can see their prototype in the video presented at the congressional hearing), so Vanko didn't need to fabricate/steal a lot of *new* gear, just get access to the stuff lying around. Then, all he has to do is stay mindful of the check-ins and make sure he hides the really incriminating stuff when he's not working on it; as a former prison inmate, he is no doubt well versed in the art and science of hiding contraband.

As for the money, again, Hammer is a dipshit. As far as he cares, any expense related to the drone legion is just another "R&D cost" to tack onto the bill he delivers to the military. He's not sitting there counting nickels and dimes, or asking a lot of questions. Hell, if Vanko looked him dead in the eye and told him that he spent six figures from the budget on cocaine and escorts, Hammer would probably say "great, how are the drones?".