Well good luck on your map sir. I am myself a mapper. I just suggest you do something that you think no one has done before. You know be creative, it's your map, if people don't like it they can leave. Also, make it nice, and good looking like the galaxy map is. It's clean, no holes in the map, textures look nice combined, and has good scenery. One big advice I have is to use nodraw, to reduce the compiling time by a lot. I use it on all of my maps, make blocks with no draw then texture them in.