You can make a defilante map by using the scroll map code found
here.
After that, all you need to do is use the criteria listed for the P18 (Defilante) maps, which can be found and submitted to
here for approval.
If your map is interesting, fits all the criteria, and is liked by the Mapcrew, that's when your map will be permed and will start appearing in Defilante rooms.
If you have any further questions, I'd privately message a Mapcrew member themselves, since that's where their expertise is!
Question answered, Thread Closed.