Weapons were never the main focus anyway. It was more about the science and the tech. And, I know he was working on building another arc reactor to power that building at least.
But, the weapons we have designed are usually with certain things in mind. I don't think we've produced any weapons which were for use by anyone but the displaced. The public stuff was all the tech.
Mr Stark will be good to have on board as a consultant or something. But, there are a lot of us who are as much prodigy's as Tony Stark is. We just didn't inherit multi-national technology companies to build our inventions. Some of us had to find other ways to follow the science. Other people to see our ideas. have the same advantages as him.