I thought it might be fun to add an optional second layer (I will keep the map format secret for a while though )
this is the result
notice how the mountain is not drawn correctly where it gets culled by backface culling, I can't help it - just don't make mountains steeper than they are in the original maps.
The grass looks a bit yellow because there aren't many elevations, in real terrain it looks good.
This was just a test, but I thought it looked interesting enough to post.
It's going to be one hell of a job to write A* for this though, seeing as there are 2 layers.
EDIT: if you really want to make a double-layer map (you can't use it for a while anyway) then you can download a merge-tool , the syntax is MergeLayers ground-layer upper-layer output-file