Thanks for the link! I'll probably end up doing an 'IKEA hack' similar to the one pictured here
. My tentative plan is to create a continuous catwalk that wraps around two or three sides of a room. The challenge I have with my room(s) is limited wall space to put the climbing platforms leading up to the walkway.
The nice thing is, IKEA shelving is relatively inexpensive (SO glad there's one not too far from me). Need to start thinking about how I can make it work.