I tried to make these as user friendly as possible, they are a little complex when you want to create hilly roads and such with the terrain mound prefabs, but with a little trial and error you should find it easier.
They are a little outside the norm for FPSC but it gives me a kick every time I see a bunch of enemies jump down from a road 'ledge' as they come after me.
'Null space' doesn't come into play when using these as the segment height max is 40" (any higher and you get floor culling issues).
Null space prevents characters walking off ledges, gantries etc.
It should be noted that Dark AI has problems with uneven floors but all standard AI scripts should allow enemy collision just fine.
If you run into any more problems, just ask
You only have one life ... Abuse it well.