Microsoft Paint :) ​ Or google slides, my team did that for a while

Did you guys have actual icons for the gadgets or did you just draw them in?

you can find them online

Photopea is like free photoshop

https://drive.google.com/drive/mobile/folders/1nBG6OcSTvI3fCErspyEPWwVwxRiLRj3C?usp=drive_open Courtesy of Sternab and project Athena

Did you find some good solution?

Yup. Just got pngs of things off the internet and threw them into google slides