My Rats' New Cage Setup

I just cleaned my two hairless rats' cage today and I decided to add more to it. I had a hammock earlier but it was attached to the top and really a pain. So I made some modifications to it and boom it works. Also I added that apartment to it.
When I have it open, the rats try to get out so about a week or so back I made a knex ramp/ladder. They go down it, but they don't like to go up it.  
My hairless rats' names are Buttercup and Delilah.

I am entering this into the I Made It Photo Contest so vote for me.

Any feed back is welcome.

Thanks
Zippy