Batman crashing through the window had to happen first SOMEwhere, and here it is. It makes sense. This is what Batman thinks bats are like, even though if there's one flying animal that should be crashing through windows, it's bats!
Before Tony Stark, there were a couple of Iron Men. One was a Canadian superhero from the black and white days of wartime comics rationing. The other was this bucket of bolts from Quality Comics' Smash #1. Although the issue doesn't actually feature any DC stars, Smash Comics WILL produce a number of them, so it's finally time to bring some Quality books to the evolving DC Universe, even if the company won't sell off its character catalog for some years yet.