I saw the SSR sheer scale rotate method to create the isometric perspective in illustrator but the tutorials either lacked enough detail to use as a handout or were how to make a cube.
I saw one by cody walker for how to make a Fender Stratocaster which was very good using SSR, but it showed you the technique and then left you to work out the rest.
So I made the instructions for a les paul. Takes a while with beginnners to illustrator and paths when teaching. I couldnt find good enough details/blueprints to do the levers or straps.
You can see the tutorial in http://vism.ag/vol3