Tailpiece not aligning with trap
Install a 22-1/2 or 45 degree elbow on the pipe protruding from the wall, then a short length of PVC, then a threaded adapter. This gets the plumbing much closer to where it needs to be and gives you more alignment flexibility with your trap. You could swing the trap directly behind the tailpiece, recovering some storage space. 

The black section in the photo from this answer shows what I mean.



You can probably accomplish the same thing with compression fittings, but I prefer cement-welded plumbing wherever possible for reliability.