We've had a few scratching posts over the years and this is the first one that hasn't fallen apart. The cats managed to rip the carpet off it but the structure is fine so we decided to fix it. It was a simple job. Pull off the old and replace with a fresh piece. I looked around for off cuts but settled for a carpet mat from the hardware. There is enough for us to re-cover it at least twice more.
Howard used really strong u-shaped nails to hold the carpet in place. We resisted the temptation to glue it in place realising it would be almost impossible to remove.
The cat's are loving it. And they're leaving the door frames alone.