sWe

It looks good at first, but when you think a little about it, I can't see how the adhesive bed will stay solid, as Sir Ramic also stated. And the added cost is over the top, unless the job is huge, and this system shaves days off it. But still, I wouldn't want to risk compromising the addy coverage.

sWe's compilation of guides to tiling

sWe's materials calculation spreadsheet