In a word, yes… someone did this over a year ago when the world saw a mod for Half-Life 2 called Black Mesa. Did you forget it? You may have, but it was a huge step in the direction everyone had expected from Valve when they showed us that Half Life 1 would be remade with the Source engine. What we got from Valve was the same old content with little updates that was modified to work with the new engine.
What we wanted, however, Black Mesa gave us as a free mod for Half-Life 2…