Capital: Muscat
Leader: Said and Salim Bin Sultan, a dual leaderscreen would be awesome, have the two argue or conspire with each other before arriving at an answer, if that's too resource intensive for Firaxis, just Said would be fine too.
Start Bias: Coastal
UA: Gulf of Riches- Sea resources provide +1 Gold in international trade routes, gain +1 influence per turn with city states you are have a trade route with.
Non BNW UA: Gulf of Riches- Harbors increase City connection gold by 33%, pearl resources provide double quantity and +2 happiness for Sea luxuries.
UU: Dhow-
Cost: 130
Strength: 17
Moves: 4
Replaces Caravel, -3 Combat Strength but may establish a ten turn trade route with any Civ for 25% less gold, can only be done once per Dhow, may also do this for food, but not production, to stop people from spamming Dhows and then mass sending production to finish wonders in like 3 turns. Would decide on the value of the route based on the city it was built in, but doesn't gain the extra gold from sea resources, as in the UA. Distance is reduced but this doesn't really matter, as you can simply park your dhow a few tiles from the city you wish to trade from, as distance is worked out from the Dhow itself, not the city it was built in. half the maintenance cost.
Non BNW UU: Dhow- Replaces Caravel, has +1 movement and gains +10 experience per sea resource worked by the city it is created in.
UB: Hasan Al-Bahr-Replaces the Castle, but may only be built in coastal cities, does not raise city health as much, but allows the city to make one additional international sea trade route, with a reduced range and half the gold. This trade route is tied to the Hasan, and so cannot change its home city, it also can't perform internal trade routes.
Non BNW UB: Hasan Al-Bahr- Replaces the Castle, but may only be built in coastal cities, luxury sea resources in this city yield +1 gold, +25% production of fishing boats and +10% for naval units.
Obviously a very powerful gold making civ, a la BNWs Venice, but only as potent if working on the sea, expect to hug the coast when playing as Oman, and you may end up with that characteristic shape the empire took in real life, running along the coasts from Iran to Kenya. Even without the huge trade bonuses if you don't have BNW, Oman will still allow the player to swim in gold, with its harbors and castles maximizing the amount of cash it can bring in from luxurious, metropolitan coastal cities.