Generating content (dungeon) using UE4

I would like to create generated dungeon in 3d using UE4 and I MUST use light maps - can’t use dynamic lighting. Was trying to do something like this in UE3 but wasn’t able. Now I have source, but I don’t know where should I start.

Could someone from Epic let me know what will be the best way to generate random dungeon?

I was thinking about creating lot’s of corridors, rooms. Each in different streaming level. When game loads use offset to change streaming location, but I think that there is better way.