Wow, that's fantastic oosyrag, thanks so much. I'm guessing this is a Construct version of the article you posted from the ClintBellanger site?
Looking around the net at other isometric game examples, I assume most people use the 2:1 ratio of tile dimensions because it's easier to do the math. Interestingly, in the illustration field, isometric art is generally more often created using 30° angles, presumably because 30 is an easier number than the 26.57° that's needed for 2:1 tiles.
Next I'm hoping I can adapt the info from your isometric z-order project.
Thanks again for the example.