Wow! It's amazing when something as complex as this pops up seemingly out of nowhere. Much better than boards that get talked about for years but never happen, haha.
This should certainly help resurrect a few A4000's that have suffered battery damage (assuming you decide to sell or otherwise produce additional boards).
How about for a "phase 2", incorporating some of the more common A4000 motherboard mods, such as PIO2 and 64MB of RAM mod?