Countdown page is on the way, which will also contain the rules and further explanation, as well as an example (not base!) map for the scales.
Currently, I've set the following rules:
1. The map must represent part of a city. Whether that be housing, offices, industry, military, other. You're free to pick the style/culture, it can be human or alien, as long as the purpose of the buildings is clearly visible.
2. The scale is set as 32 units per floor, which is approx. 2.5 meter per 32 units.
3. Custom content - textures, models, sounds, sprites - is allowed. In fact, even encouraged, because you work at a much smaller scale so creating some specific textures for buildings to cover them easily is probably a good choice. I'll provide an example map and .wad soon, and those that have problems creating custom stuff can always give me a yell - this might be a nice opportunity to broaden your skills.
4. The map must be playable under Half-Life. You're allowed to create it for other mods, but this will be of little use as all maps will be checked with plain Half-Life.
Maps will be judged a little on originality, mostly on the general impression and feeling of the map. Which means, detail ahead, but detail wisely - where it counts and really adds to the map.
Sounds good with everyone?
When shall we start and what deadline shall I set?