Low cost radio telescopes are great fun.

A few other similar projects:

https://astrochart.github.io/

Https://arise.seti.org/

https://wvurail.org/dspira- lessons/

https://www.haystack.mit.edu/haystack-public-outreach/srt-th...

https://pictortelescope.com/

https://github.com/0xcoto/virgo