Can you do it man wud be sick cus i saw that high bridge, then thought nice main wud be for high higher ground or something i pretty much suck at maps or i wouldn't ask for the thing
there has already been high highground. but there is no 2/3 chance of being hit anymore, plus you can see from "highground" to "high highground" without floating building/airunit.
on some tilesets (snow?) the high ground looks the freaking same as the low, so you could make a buttload of grounds. i don't think the added complexity would be useful in any good maps though. _maybe_ a 2 player map, but it would probably only be for looks.
Im working on a technique never before seen on a map design, all I can say now without giving away surprise is the main bases are gonna be somewhere never before seen on a map.