Obviously this isn't a completely new unit...  It's just a conversion of the game's Caravel to give it a Crescent symbol (Muslim) instead of the Cross (Christian).  I suggest the same stats and all that just make this one usable by the Babylonians, Persians, Egyptians, and any others you might add that would be of mostly Muslim origin.  Make sure you turn the original Caravel off for these civilizations.  To add the new Caravel to the upgrade path just change the Trireme to upgrade to this one and this one to upgrade to the original Caravel...  just leave the original upgrade alone and it should work fine.  On a side note I found this to be more time consuming than making my own unit from scratch, mainly because I had to edit more individual pixels by hand to get the animations to work right...  I had originally thought of making another conversion...  the Frigate with Crescent symbols as well...  but at the time being other projects are ahead of it in the queue :)  Enjoy.

-Kinboat