FWIW, as a follow-up after doing a little digging, a 747-8 is worth $50,000 to $200,000 in scrap, depending on their condition. I'll assume the high estimate here.
Engines and other parts could be worth more, depending on their condition and status of their last maintenance major actions. However, due to the Qataris effectively 'retiring' this aircraft, I have doubts as to whether it underwent a significant maintenance overhaul just prior to it leaving their fleet, which could greatly affect their worth.
