REctangular maps, from WM to dev kit?

So I’ve created a map that is rectangular in world machine,with the intent of having the map end up being around the same total area as “the center.” I’ve set my bounds in WM to be 10.7 km by 6 km which gives me a total area only slightly larger than the center. I’m wondering what would be the best way to get my map from WM into the ark dev kit while preserving all the features I’ve created in world machine, and while keeping the map relatively performance friendly?