Very odd. Can't seem to upload images just now. Anyway...

I tried out markers (Prismacolor chisel/fine) on some test maps and have decided that's a can of worms I won't open. Will try colored pencil with fine-line markers (Staedtler) for details. In the meantime I've scanned in the map and cleaned it up for coloring in PS. I've got some of the features in there...but can't show them, unfortunately, until upload is working for me again.
M