Me and NoisyMonk have started a new mod. Its called C&C: Kings and its a medieval based mod. It will be for Zero Hour and will have different Kings for each country/continent army. We'll have cool units like catapults, balista, archers, knights, barbarians, and other medeival war contraptions. Here's some pics of the beginings of some units:
*edit* Images uploaded to our new host so they should be faster.