I built something for my cats, and they're actually using it!
Large catios were coming out at £500 or so, and they weren't the right sized for what I needed, so with a mixture of Screwfix and B&Q, I built my own.
Obviously, whenever you do anything for cats, you run the very real risk of them absolutely ignoring it, so to put £250 and a weekend of work into something was a pretty big gamble.
However, I'm delighted to report my cats are thrilled with what I've built, and are using it regularly.
We live very close to an A road, so letting them out was never on the cards, and they were rescued as indoor cats. However, they have had all their jabs, so they were vaccinated like outdoor cats. I figured there was a part of the garden that wasn't being used, and it could be accessed by a window, so I gave it over to a catio.
Some scratchy stuff, things to climb, a little house, a cheap tray and a branch from a nearby copse of woods, and they're loving it.