I am not too sure what you mean by "stacking" the levels. If you mean display them one above the other, I don't think it will work because of the various details on each level interfering with the others. If the levels were not transparent then you would only see the top level. If you mean to display the levels separately but positioned one above the other (from top to bottom for example) then it is just a matter of placing them on a PS document in descending order and adding the appropriate text for each level beside it. You could even do this after beautyfying each level in their own PS file.