HOW TO USE ANY FANTASY ART OR IMAGE FOR INSPIRTATION TO GET IDEA FOR ANY ELEMENT OF YOUR NEW MAP . THIS IS MY IDEA OF NEW "ISLAND" MAP . LET'S CALL IT "CHRONOISLAND GL77" . HERE ARE THE IMAGES WITH MY COMMENTS AND HOW TO SEE WHAT SIMPLIFIED OBJECT TO CREATE TO ASSEMBLE THE MAP . THIS IS NOT COPYING OR DERIVATIVE WORK BUT TOTALLY LEGAL TO BE INSPIRED TO HAVE SOMETHING DIFFERENT BUT SIMILAR AT THE CORE .
FPS likely won't be the issue because models don't have to be high in polycount. You just need good textures on them. A good example may be World of Warcraft. The real issue will be Warmerise's map size limit - which is 12 Megabytes. The more models, textures and other stuff you use, the faster you will exceed this limit.