*OFF TOPIC*
I am using 0one's version of the "Caves of Chaos" as a first adventure.
*RESUME TOPIC*
ON TOPIC; related.
I used the same maps. With the "Keep" (0One's version of "the Borderlands") being controlled by a seneschal/castilian until the Lord returned. It was hard for the PC's to arrange a meeting with the guy in charge because of their lower standing. They had to clear some of the caves and rescue miners from Kobolds before they merited a face to face meeting; social standing increased/bonus on reaction roll.
My reasoning for the dissimilar creatures living so close to each other also involved a bit of social standing. Priests of Iuz were recruiting "monsters" to live in the area to cause chaos (ha!), starting with the Keep. Naturally,the pecking order was a "might makes right", but also involved who was more involved with the Old One (Iuz). Because the Kobolds provided the most intel, they actually had more pull with the Priests than the Minotaur, Orcs, etc. Although they knew not to challenge these stronger foes directly.
Eventually, the Drow were involved. So many demons were tied up in a Hellwar, that Iuz's had less shock troops to invade past the Vesve. Lolth, Demon Queen of Spiders (Drow God) allowed some of her hellspawn to gate in to assist Iuz. If the PC's can shut down the gates in the Drow city, this will greatly hinder the Old One's advance.
The group is having a tough time among the Drow, because they are of a 'lesser race' and all male; female Drow are the dominant sex. Currently, they have an equivalent social standing of escaped slaves.
When Iuz pushed the Horned Society (collection of Orc, Ogre, Brigand lands) into the Shield Lands, the Knights of the Shield were all but destroyed and scattered. For the few remaining Shield Knights, people of the surrounding area look down on them for not being able to hold the line; lower social standing.