You're right, the saddle is a Brooks B17. The downtube shifters are the stock SunTour Power Shift units, which are the nicest friction shifters I've ever used. The handlebars are Velo Orange Milan. And no, the brakes are not stock. The original Dia-Compe calipers weren't enough for me, especially with the shorter brake levers on the new bars, so I upgraded to modern Tektro dual-pivot calipers. It stops on a dime now.
It's true, the Mirage's three cylinder is hardly the smoothest engine out there, but I'll put up with a lot of vibration if it means 50mpg.
I do enjoy music, but only in an otherwise quiet room. I like long walks with the dogs in silence, or long quiet bike rides. My favorite button in the Mirage is the one that turns the radio screen off.