I've seen these things before, but didn't know about the use of Cherry MX Browns. What I DO know is that they're fairly popular amongst the flight sim community, especially pit builders. (However, the CH Products Multi-Function Panels, basically rebadged Ergodex DX1s, have eaten somewhat into that. Not quite as expensive, for starters.)
Even if they don't get one of the X-Keys pads specifically, they may go for that 128-key matrix encoder and wire up their cockpit switches to it.