The lines in the wall would be better if they were protected from stray nails. At this point of the game, just hold your breath and hope no one else hits the piping.
The condensation pump is subject to fail and allow flooding in the attic. I would prefer a gravity drain but remember to put a running trap in the end of the line to keep insects from entering it and causing a blockage. Also leave some form of inspection access near the unit, leaving you an opportunity to use a snake to clean it out periodically.