I've no problem with elven walls. There's no need to always fully go with the stereotypical "wood elf" theme. Tolkien's Noldor elves, for example, were great craftsmen with interests in metal/jewel working, mining, stone architecture, etc.
I'm really annoyed with the modern conception of elves who tend to look like nothing more than a combination of Robin Hood's merry men and Ewoks. There's no reason for nature and advanced architecture to be mutually exclusive. The ramparts on elven walls look like leaves and blend pretty well. Maybe they could use some more moss...
The first duty of every Starfleet officer is to the truth, whether it's scientific truth or historical truth or personal truth! It is the guiding principle on which Starfleet is based! *Jean-Luc Picard*