I successfully made the buggy from the raspberry pi website: https://projects.raspberrypi.org/en/projects/build-a-buggy and I am happy with it because it works and everything.
BUT the chassis is made out of... well it looks like particle board, probably with asbestos, whatever material it is I do not to like it.
Does anyone know of a set (like erector sets but not that exact set) that I can build a chassis out of that is made out of a better material?