The area you have designated there, in just land alone is 3,564,504 square km (minus a little due to projection). If it was just a block of land and nothing else it would be a box 1887 km (1172 miles) per side (887 km or 551 miles larger than our maximum suggestion). It is a truly enormous area to map, and roughly half the size of the lower 48. My suggestion is to map such a country state by state, or start with something like the 13 colonies and expand from there with new plots after finishing the first. That would give you plot sizes more consistent with our guidelines.