After studying Mr. Balshaws excellent build, (GB6 Cold war, Page 7) I have settled on these 1/35 oil drums to form the center humpy thing that seems to be important, and bits of sprue and wire should do for most of the rest. Got a free credit card in the mail the other day, so I'm good for my flat plastic needs on this one.
I have a book that the same thing you could do well for the depth of that engine will watch tomorrow Kandu get some scanned images is P W even if the engines of the 747 but more or less the lines of the combustion chamber and the feeder of the afterburner typically similar