I worked on a similar satellite, the nanosat-5 (1m3 size), which also used magnetotorque for orientation. Odd choice using arduino, I guess for buzzwords? Also it looks like they are using very little shielding. We used several layers of shielding and a very thick hull- close to a centimeter, and each module in the device had a separate hull. We also had a lot more sensors, including some pretty complex equipment (an electron spectrmeter, an auroral imager, a plasma probe...).

I really hope that commercializing space doesn't kill off the ridealong programs- I think there is a ton of potential in crowdsourcing this sort of thing.