In response to Terra, this might be possible. It should be able to draw more interest than the last project, which had like five people and ten stages to create. bustin98 did the artwork, I did four stages, and the other three did two stages each.
This Zelda game might not be as difficult because:
a) we'll likely start this, or whatever we choose as the April Fool's project, earlier than we did this year
b) a Zelda game in particular should be able to get us more interest and hence, more mappers
c) we already have most of the resources we need, including everything from existing Zelda Game Boy Color games
Even if we only had five mappers, let's say everyone does two dungeons except maybe one person works on the overworld. That would be enough. The dungeons themselves can't be too hard to make, even though they're original ones...slap a bunch of rooms together, then edit the doors and room layouts. We could figure out new obstacles and puzzles that work on the day/night dynamic and new items of our own design, but so much could be done with what we all know about Zelda puzzles (defeat all the enemies, use certain items in certain places, make it to the treasure chests with small keys inside, etc.).
The overworld might not be so bad either. It could have places that are by default day or night, like the map for the overworld in Seasons. And making two maps (one for day and one for night) could be as simple as taking the day map, darkening the palette, and editing some things to be more nocturnal, but the overall layout of things wouldn't ever change drastically. The overworld should have areas thematically linked to what dungeons we brainstorm but it is feasible. I would imagine building it in something like RPG Maker, if only because it'd be easy to use the grid and slap down tiles and spend more time and energy imagining the layout than measuring the placement. We'd just have to be aware of what fits on a "screen" to have realistic layouts but that isn't really a problem for us here, I'd imagine.
"Oracle Of Hours" is better than "Oracle Of Day & Night", marioman. Good suggestion!
I'm warming up to the idea, as you can tell. Plus, unless someone comes up with a better idea within the next few weeks, we may have to go with this one, but I'm sure we'll enjoy this once we get into it. It's not too difficult and it also allows for some creativity!
I also think it's likely to fool at least some people. Even if not, it should still look really good.