Thanks for the link, Ivoss! And thanks for the wire suggestions, as well guys. Chris is actually a plumber, so we have a surplus of PVC lying around! I'm sure that's going to be Chris' next favorite project; once it gets going I'll be sure to let you all know how it goes. 🙂 Any ideas on what the maximum space between pipes would be? We don't want him wriggling and squeezing his way through.
This might really help for while I'm away!