So, in chapter 67, the characters head to Orvud district (Crunchyroll's spelling of the name)
I made a map of it, but its pretty glitch, I gave up. The spawns are confusing (its like its force setting it to team mode) and it takes a lot of messing around to get it to spawn the crawler.
Speaking of the crawler, I tried size 10-20, that seemed to work with the right amount of overpoweredness (as in, this crawler is supposed to be bigger than the colossal and untouchable). I put some detail into the city, the rest is meh.
so here.
Script:
http://pastebin.com/GzKB8yPq(that 60,000 character limit is a jerk)