using version 1.02 of RoM
Small, Continents, Noble, epic, picked Greece. I'll pick Tiny next time - I have too little pop compared to the others (too few votes). I disabled the space and conquest/domination wins, basically leaving diplomacy and time. That may have been a mistake.

I've had a mix of resources - e.g. Iron + Coal + Uranium but no Oil. Not having Oil is a major problem in the modern area - no airplanes and no vehicles.

There may be some balance issues. I've been running on 100% science all the way and am leading in tech. I have a of money and my city is producing tons of culture. That may be OK in OCC, but it doesn't give me much to chooce between. My production is quite high - most units take 1 turn as do some buildings. Wonders are usually 6, sometimes up to 10 if they're recent. National wonders are around 4.

My city is large - around 30 (goes up and down a bit). The civic bureaucracy is a must - +25% food (IIRC) is way too good to pass up. That may even be unbalanced in an ordinary game.

I've built most of the wonders as I have the capacity and am leading in tech. There is no restriction on the total I can build. I've seen a restriction of 3 somewhere, probably slated for RoM 2.0. I'll advise against that in OCC - it would cripple your chances of winning. In an ordinary game I'd say that a restriction of 4 or 5 in one city would be good. In OCC - no limits.

I can apparently build as many National Wonders as I like. I held off on the second for quite long, then picked Oxford Uni (picked the 100% GP building first time). That must be a bug. But in OCC the limit could be 3, not 2, as there are so many to choose from in RoM.

My strategy for winning has been to "bribe" the rest of the civs to vote for me in the UN. I got elected as secretary, but the two civs on the other continent abstains in a victory vote. Giving them money and tech doesn't help much. They don't like me trading with both of them. I guess I should pick one partner on each continent, but it's a bit late for that - the Americans (the largest nation, almost with enough votes to block my win) has a long bad history with Greece.

I've enclosed a fairly recent screenshot as well as three saves - the third is the latest.

It is amazing how these games develop into stories - a feature Civ4 has and Civ3 didn't really have. It's due to the enhanced diplomatic aspect. I orignally decided to befriend my Incan neighbours at the expense of the Americans at the other end of the continent. It worked well, until I neglected my military so much that the Incans saw an opportunity for conquest. I held them off fairly easily, but the exchange wasn't good for any of us. The Americans eventually warred upon the Incans who sought my help. I obliged, but tidn't send any troops. I wasn't aware that the Americans were winning (should have used spies or sent some troops earlier). So now the Americans are too large and hate me. The Incnas love me but are too weak.

Edit: I shold add that happiness has rarely been a problem - in fact it seems that there is a profusion of happiness providing stuff in RoM. I was able to trade for some resources using money, and I did found 5 religions, perhaps that hepled. Health was more difficult, but I was always able to push past the problem after a bit of a time through a resource trade or by focusing my research efforts.

In a normal BTS OCC, you can build 5 national wonders. But I removed the wonder limit, and you can create a truly powerful city.

The limit is 5 National Wonders in RoM OCC, That's a good limitation. I'm pretty sure it's 2 in standard BTS.

My city is size 43 and still growing. Health is a problem, but not seriously so.

I opted for a war against the obnoxious Americans. I can beat them easily enough, as my tecg lead is considerable. He has no fighters and no mechanized units except jeeps and I'm at Jet Fighters, Nuclear carriers, Aegis cruisers, Modern armor etc. I can't build as many units as him, but they live longer.

I did lose one fully loaded Nuclear Carrier to a series of attacks by Ships of the Line, though. I watched in disbelief as the carrier went down. Aegis cruisers can also be defeated by sailing ships if there are enough of them. Modern ships should probably get a good bonus against sailing ships, if that is possible.

I'm sure this has been reported before, but Jeeps, Early tanks and to some extent M60's are way too large. Half size would probably be good.

Edit: So is the T95. It's fairly ugly, in fact.

I landed with a score of 2648. City size 46, with potential for a bit more growth. Gave up the war against the Americans when my citizens started to take to the streets in protest instead of working. At that time I'd razed New York, Washington and Boston - and more - leaving him crippled. Or so I thought. He kept his attack going on my Incan ally without me noticing it, and they ended up as his vassal. It didn't make much of a difference, but the Incans should have been my vassal instead.

Some of those research dependencies aren't apparent. I got an advanced ecological tech, allowing me to build a dome and reusing the Haga Sophia icon (according to the tech tree and Civilopedia). But it wasn't available in the buidl list. I also got Fusion, but couldn't use the nifty-looking fusion ships.

I'm a bit concerned about balance. I would not have been able to get the tech to build the spaceship in time, and I was leading in tech - a good deal beyond the others. I'm not sure how this would go in an ordinary game, but I suspect that you have a hard time getting to the end of the tech tree, and that the tech isn't, n general, aligned with historical dates. But it's just a suspicion for now.