I've never built an RFW map, but apparently it takes a buttload of materials. You've got to get an area for iron, diamond, etc. You also have to build the whole landscape too. It seems hard to get that much resources for this. That being said, it may be interesting if we try to do one side survival.
I also think it would be interesting to theme the map to be Project M themed. We could use builds from the server and use them in the map. For example, I think it would be funny to implement method's storage room and fill it with cobblestone, or use Paul and Simon's mansions at the VIP village, or some other builds that people have done. I think this would give some flare that would really make it feel more personal.