You are talking about making a ladder THAT WORKS?
Well, you can make the angle to high. I think that if you use an angle about 20 (30 max, somthing like that, I'm not absolutly sure since I haven't played BL for a while) on the x or y axis.
make your stages for the ladder (those stairs), but remmember not to put 'em to high, since if you will put them to high from each other, it won't work. any way, make them 1 tops.
I hope I helped you ;),
if I didn't, post here and i'll try to help again "}.