At the start of the game (using quick start) this model doesnt seem to have collision on the part I'm trying to stand on - my character's legs sink into it. I raised the brightness of the game to make it easier to see, and used the console to get the ref ids. I don't know if I actually selected the correct object though.
If you look at the legs you'll see they go inside that lower step. This also makes it so I need to jump to get up to the higher platform. I hope I did this right.