That is incredibly cool. The actual beginnings of me getting into MAME was the desire to build a cockpit cabinet for flight and mech sims.
I wanted something a little more traditional, similar to a Star Wars cockpit with pods at the side for flight controls (I wanted a stick and throttle for combat sims) and a place at the front to install and remove a steering wheel.
The one thing with a commercial flight simulator like that guy did is that you really have to LOVE commercial flight. Doing the realistic flight plans would leave you with nothing to do but sit there for hours at a time. I think it'd get tedious, but the fact that he did it so convincingly is just as amazing as someone building a complete replica of an 80's arcade in their basement.