Here's a idea.
Load up VHE and browse the following textures:
filter = oxy and take the plain blue texture
filter = fuel and take the plain red texture
filter = crete3 and take the three wall textures
filter = stripe and take the red and white one
That could be our texture set. Maybe a { texture for a floor grill too.
The maps would be for HL only, although you could choose DM or DOM. The maps would be relatively small, 4 to 6 player capacity. Maps can be made individually or in teams of 2. Individual mappers can have 2 entries, team mappers only 1.
With the limit in textures, judging would be done more towards layout and architecture and entity scripting. No code moddifications like GMDM2 (save our poor souls please)
The theme would be common. Some kind of Quake/Unreal/Elite Force theme perhaps?
[addsig]