Don't permanently installed electronics in a certified aircraft have to have some kind of paperwork? Or is the permanent tray just considered wiring and the active components are 'not' permanently mounted.

There are a number of private 747's. I think most are royal families though - think Saudi and Brunei.

I know Chrysler Aerospace, err I mean E-Systems, err I mean Raytheon, err I mean the new guys down at Waco did a royal Saudi setup. I don't know what the plane cost, but the interior was certainly not cheap.