I helped out at a science fair, demonstrating some basic robots, but then someone suggested entering the PiWars robotics competition for 2022. This is now a big distraction, so here's some basic pictures and links. If there aren't many updates here, its because there's lots of updates elsewhere. There's a blog and a website with updates of what we're building.
PiWars 2022 is about building farm robots, particularly to solve 4 challenges typical of a farm. Full details are on their website here.