That is a brilliant design SnuggleHam! I love that! My gerbils would love it too no doubt!
You`ve given me food for thought now!
Can I ask, how are the metal ladders attached to the long wooden ladder? And is the wooden level put together with small nails, or nails and glue?
I really do like what you`ve done and no doubt, your father in law could get rich taking orders!