Want a new world with 20x15 lots - like another Magnolia Promenade

While I would absolutely love, love, love something like this (though I'd say 15-20 lots would be appropriate if every lot is tiny,) I hope that we get another map with large lots next. It's been feeling a bit cramped on the latest maps, with mostly 30x20 and 40x30 spaces. I can combine small lots onto large lots, but I can't make large lots convert to small lots.