Here are a few custom maps I made up for Megamek:
Oasis: pretty much what it sounds like. Designed as a
companion map for Desert Hills. Simple, but fun.
Cratered Highway: a lonely road that has suffered an
intense, large-calibre artillery bombardment. Maybe a
little too busy, but I like it.
Canyon Crossing: a double-sized map (32x17 hexes),
containing a wide sublevel 5 canyon, crossed by a
single bridge. Should make for a brutal fight.
[Note: canyoncrossing2 is similar to the original but has
a double-width bridge.]