I got back into mapping FF6 last week, and I'm getting real close to completing the entire game. Since the update this past weekend, I've completed Umaro's Cave, the Phoenix Cave, and the Fanatics' Tower. All that's left to do is the Lete River, Cyan's Soul, Ebot's Rock, and Kefka's Tower.
Lete River: Still a pain in the neck, lol. I've tried using the remote viewing code that I found, but it's pretty much useless when riding the raft because it messes up a lot of the tiles on screen. But I've decided to use Troy Lundin's Lete River map as a template to fill in the extra areas that I can't reach.
Cyan's Soul: I've got it mostly mapped out. Just need to work on the mountain side areas where you're in the Magitek armor, and the interior areas of Doma Castle. I'm not going to bother mapping the castle exterior, because it doesn't relate at all to the scenario at hand.
Ebot's Rock: A very cumbersome area. Pretty much have to capture it all via save states since the visible area in game is very limited (and which cannot be remedied by toggling layers).
Kefka's Tower: Haven't touched it yet. I'm going to leave it until the above three maps are done. Looking forward to working on it!