Maybe something like this?

https://pin.it/6S5xYRg

Hi Gee. If you know the measurements of the catio that you want, you can go to You Tube for a step-by-step tutorial. They have tutorials on everything under the sun. I know because I use it all the time. Good luck Gee. I'm hoping all is well with you.

Hi Gee, what a lucky cat you have. Hope this helps you build a catio for your furry friend. DIY Catio Plans - Catio Spaces

catiospaces.com › catios-cat-enclosures › diy-plans

Build one yourself…or hire a carpenter to build a catio plan for you! Catio Spaces offers a variety of DIY CATIO PLANS that take the guess work out of building a catio to SAVE TIME AND ... “I'm a 55 year old nurse, and if I can do it, anyone can!

Here's a nice link, just click on catio plans:

https://catiospaces.com/catios-cat-enclosures/free-tips/8-tips-for-diying-your-catio/

Here is some tips to help you. https://youtu.be/NJDPZJtmhSM

You can learn most of what you will need here: https://catiospaces.com/catios-cat-enclosures/cat-behavior-enrichment/build-diy-catio-plan-for-your-cat/

Gee: maybe this will help

https://makeit-loveit.com/diy-rope-plant-hanger

Here's a cute one. https://www.hometalk.com/4359383/build-a-catio-a-tiny-screen-house-for-kitty-cats

Build A Catio ~ a Tiny Screen House for Kitty Cats!

Hi Gee, here's some info I located. I hope it's helpful.

https://www.rover.com/blog/catio-buy-or-make-your-own/

This site may help:

https://catioworld.com/diy-catio/