I started working on it myself from scratch. Here's where I'm at so far:
1.Changed European part of map to one city islands and took away ambphibious attack from units to keep computer from attacking capitals.
2. Added a resource called Europe and placed it on each European island capital. It is the required resouce for all units exclusive to the "Old World"
3. Added a canoe (0/1/1) unit as the exclusive naval transport for native american civ's.
4. Added "El Dorado" wonder (makes explorer ever 8 turns) and "Fountian of Youth" wonder (gives city growth)
5. The UU's I have so far are: England, Sea Dog and Pilgram (colonist that doesn't require support) Netherland, Caravel and Swiss Mercenary France, Trapper (explorer/settler combo) and Musketeer Spain, Conquestador and Tercio Portugal, Caravel.
Any thoughs on these? I'll add founding fathers next after play testing new units and debugging.