This thread interests me in that I was involved with the BBJ,I can tell you that the cost of the A/C was nowhere near the cost mentioned it was in fact roughly half the quoted price and incudes the interior.The other figure given to refurbish a B747-SP is so far out as you can make it,I know this also as I was involved in just such an aircraft being refurbished last year and if the agency could tell me exactly which facility it is I will guarantee to send work to it.