My computer crashed over the week-end so I had to resort to doing this the old way, relying on Chambers, Bradford and a few other old trusted volumes. Finished the grid, got the two sets of words and the antithesis, which I presume should be in the original language, but I'm blowed if I can see which of the missing vowels should given the connecting word treatment. "Guided by the cell contents"? Hm. The last penny still has to drop.
I think some of the comments here have been a bit blase about the quality of this crossword. Some of the cluing is superb with cunningly disguised misprints in some of the definitions. I especially liked 45dn.