Hi Nick,
Good luck with the series.
I worked for Qantas in Sydney from 1975 - early days with the 747s, Fifth podding PWJT9-7F engines (bolting them under the wing - 5th engine!!) with regularity - sending them back to the States for overhaul. Smoky, noisy, unreliable water injected engines.!!!
Great jets though - I miss them.
Regards...
JS.