Award-winning editorial and news graphics artist Ninian Carter shares his processes for producing a complex isometric illustration of a water-bomber aircraft in Adobe Illustrator. Ninian also generously makes his Illustrator file available for download at the bottom of the page so you can open it up and explore.
By no means is this a do-as-I-do tutorial, but it looks like he uses a scale-shear-rotate method similar to Cody Walker’s Advanced Isometric Tutorial.