Here I took the hull of a polacre and changed the rig, to show how similar a xebec is to a polacre.
I took the liberty to create a diagram of basic xebec anatomy.
Here I drew the basic anatomy of a lateen sail and its rig.
A xebec with the foresail on the opposite tack
A ship-rigged xebec, which debateably would be a polacre