Stevie..
If you download and install Wildman's Commanche 4 terrains you'll have a whole new area to come up with more ideas for maps, some of these terrains are great!
I have one map already done (co-op) but I need to correct errors on it due to a change in the elevation map that he made after I completed the map.
Look for his latest post in Map Editing and you can download it from there or contact me by email and I'll send you a copy...