waltr, I have not heard of this before. Thanks for the info.
jwatte, luckily a 1U cubesat is only one kg.
I think the duration of the mission will also determine the need for rad hardening. I think a 1-3 month mission wouldn't need a whole lot of hardening or none at all. But that's my guess. Have you read anything on effects of radiation on electronics? If so, care to share where?
I hadn't found any such forums on cubesat.org... although I was also thinking outside the cubesat realm as well. For example, the balloon project mentioned on SoR.