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| Get a branch or a trunk of pine from the forest: there are often dead trees lying around. The pine has rough bark that cats can climb with their grippy cat hands | |
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You are not allowed to remove from the woods/forests anything bigger than your arm - so that won't work.
I hope you already have a cat-flap - if not getting one installed in a sealed unit gets expensive.
Meanwhile I build polycarbonate replacement panels - and spiral staircases. Neither are cheap - but the combination is self supporting - and need no mounting into the building.