HERE IS A MAP IDEA .
CREATE LINKED BULDINGS . DOES NOT REQUIRES MUCH SKILL OF MODELING AND CAN BE DONE DIRECTLY IN UNITY .
HAVE GLASS TRANSPARENT SHADER I BELIEVE IT IS ONE OF "LEGACY TRANSPARENT " SHADERS IN UNITY THAT LOOKS TRANSPARENT WHEN MAP IS EXPORTED .
USE SIMPLE SHORT BUILDINIGS AND MAYBE HAVE BUILDING WITH 4 FLOORS AND THEN 6 AND THEN 8 ETC .
MAKE SURE EACH FLOOR IN EACH BUILDINGS NOT TOO HUGE AND MAYBE FITS LIKE 40 HUMVEES . . .
ALL BUILDINGS LINKED SOMEHOW AND NO WAY OUT OF THEM BUT SEE OUTSIDE SKY THROUGH GLASS . . .
AND MAYBE ADD SOME CUBE ALMOST ISLAND AND WATER . . .