Characters getting off the terrain and onto surfaces is still a WIP.
use the Asylum building parts as a guide for constructing your stuff.
And forcesimpleobsticle=3 is what you will want to use if you want AI to get around them. Answered your FPE post in the other thread with info you will be interested in.
Floors no higher then 5cm from the terrain or AI cant deal so well at the moment.
I have been able to get them up to about 46cm off the ground with a gradual ramp, that the incline is no more then ankle high for every 3 or 4 feet forward. Zombies are going to be your best bet to even try anything with, as the soldier are waypoint driven and not free roaming.
I am sure there will be more questions.
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