This is a milti level cage I haven't built the ramp yet. I just finished this last night. I used all zip tied, and it turned out very sturdy and safe from other pets.
Neat! Very cute cage. Looks like you may need a bit more bedding though--you don't want empty patches or else you'll be scrubbing their poo off. Nice design, I can't wait to see the finished upper level!
Thanks for the comments! It is like angel said, my pigs are very active, it doesn't matter how much bedding I put in. My pigs just push it out of the way!