Catio Tunnel System - Window Board

I bought 4 tunnels and a tower/window box to extent the cat run, however when my 9 month old kitten suffered a post spay hernia which meant a second operation in 2 days, she needed to be confined for at least 2 weeks (maybe longer). My son saw all the tunnels (that had been built but not yet attached to the cat run), he repurposed the pieces and fashioned a lovely recovery pen for her, complete with a separate toilet. He did not need to cut any of the pieces so when she is recovered they can revert to tunnels again.