1) Given the historic size of the Eurasian Core, I think the old world should be about twice the size of the New.
2) Africa, other than the trans Sahara routes from the Sahel and the upper Nile, was largely unknown to the Eurasian Core in Antiquity. I think there should also be a "Southern Hemisphere" added in the Age of Exploration, which, combined with the New World, would effectively double the map. At default setting, this should include at least one Archipeligo map (Indonesia / Oceana) and at least 2 continents (Sub Sarahan Africa, Americas).
2) Africa, other than the trans Sahara routes from the Sahel and the upper Nile, was largely unknown to the Eurasian Core in Antiquity. I think there should also be a "Southern Hemisphere" added in the Age of Exploration, which, combined with the New World, would effectively double the map. At default setting, this should include at least one Archipeligo map (Indonesia / Oceana) and at least 2 continents (Sub Sarahan Africa, Americas).