Needed: Play area redux

UGH!!!  The mollies vs. weight of the bookcase hung in the play area did not see eye to eye, so mah had a patching job, and now has some paint to redo.  So now it's time to do what I was going to do from the start...  Wheels on the bookcase.  Wish me luck...  Why do I stress so on this simple area?  UGH!!!