This post is temporarily to call dibs on mapping this game, which I'm already half-way through. I had a hitch for the challenge of mapping a NES game which featured tons upon tons of fake parallax backgrounds (sometimes two levels of it at the same time!) and it's really easy so far. It's just too bad that the game doesn't look anywhere near as good when not in motion.
This project was also greatly facilitated by FCEUX, the new version of the FCE Ultra emulator. It has a ton of features that make NES mapping a lot easier such as changing the overscan color, seeing the tiles and the map in memory, pausing and advancing frame by frame, etc.
Anyway, I'll post what I've done so far tonight (up to and including Stage 4-1).
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Current projects: Metal Storm (NES), Clock Tower (SNES), Ristar-The Shooting Star (Gen), Sonic The Hedgehog (Gen), Sonic CD (Sega CD), Mega Man Zero (GBA), Battletoads (NES), Bucky O'Hare (NES)