Working on a fort dungeon has brought up some minor questions!

I want to place a dead skeleton in my fort. Is there some reason why DeadSkeleton and DeadSkeleton2 are quest objects and can I just use the darned things or what?? Confuzzling. The trap tutorial on teh wiki says to use DeadSkeleton but I get the quest warning when going to add the beastie and I'm like uhhhhhhh. Maybe just paranoid I guess.

How do I get certain FX to actually work. I placed FXTwinkleLights01 in my dungeon but have no clue why they never appear in game.

Looking at some of Bethesda's dungeons..... What are collison boxes for?