- Challenge of building something complex in a confined space.
- It should be accessible to everyone, even modders who have never modded before!
- We want to be sure it gets finished in a reasonable time. If everyone spends an average of 4 days on a room, that's still 80 days for 20 designers, plus the top and tail bits - so 100 days. Doing a whole floor each could take a couple of weeks - that's a long time!
- Most people can commit to doing a room and will be able to complete it. With a whole floor, I expect a bunch of people just won't end up having time etc.
There was a project with LOG1 which was based on "every developer making a room" and it (unfortunately) never materialised - I think this is just because if you give people a room, they can think of 1 nice idea and build it. A floor requires a lot more thought and time.