You know, that's probably a better idea than you know. One of the toughest things to do with these maps is to judge what the terrain types are per hex and where all the water bodies are for rule purposes. I'll do it in Heavymetal Map though since that's more flexible for my needs.
Heck, I've been looking through RPtools lately. You could almost surely run something like this through the software, although you'd need to avoid using the space grid for system movement.